9 LLY EGR Delete Kit Review in 2022 to Maximize Performance

There is no alternative to an EGR delete when it comes to improvising your vehicle’s engine performance. However, finding a reliable best LLY EGR delete kit can be tough as there are so many options around.

Hence, I have picked up nine of the best LLY EGR delete kits from professional and trustworthy manufacturers out there. You can pick the most compatible one with your vehicle from below and enjoy high-power, improved horsepower, torque, and brakes in your vehicle.

9 Best LLY EGR Delete Kit Review in 2022

S&B Filters 76-1006B Turbo Inlet Manifold
  • Elbows have CNC tapped NPT ports
  • Has O-ring seals
  • Powder-coated exterior
Check Price
Sinister Diesel Billet Valve Covers
  • CNC machined
  • Anodized
  • Valve covers include gaskets
Check Price
labwork Turbo Inlet Manifold Intake Elbow Replacement
  • CNC machined
  • Enables unrestricted airflow
  • Increases 80% airflow
Check Price
EGR Delete Kit and High Flow Intake Kit
  • Pressure tested for leakage
  • For the racing purpose only
  • Replaceable with the EGR system
Check Price
LLY EGR Delete Kit W/ Intake Elbow Exhaust Gas Recirculation Delete
  • Made of steel and aluminum
  • Needs tuner for clearing codes
  • Pressure tested for leakage
Check Price
Turbo Vane Position Sensor Kit
  • Replaceable with 12643471 OE
  • It comes with an adapter harness
  • Weighs 6.4 ounces
Check Price
Coolant Filtration System Sinister Diesel
  • CNC machined
  • Aluminum built and anodized
  • Includes all the hardware in the kit
Check Price
PCV Re-Route Hose Adapters Duramax Diesel
  • Made from aluminum alloy
  • Built-in O-rings
  • Provides lifetime service warranty
Check Price
Diesel Care Duramax EGR Delete Kit & High Flow
  • Aluminum and steel build
  • Provides High flow intake
  • Leak-proof with O-rings
Check Price

9 Best LLY EGR delete kit for replacement and upgrade

1. S&B Filters 76-1006B Turbo Inlet Manifold

If you haven’t come across the best EGR delete for LLY Duramax, then you might not have come across S&B Filters delete kit. This intake elbow will result in a much cooler environment for your engine to run more efficiently with a better fuel economy.

Moreover, the CNC tapped machine edges will look great under the hood, ensuring better power for the vehicle.

Key features

  • Consists Computational fluid dynamics flow simulation software
  • Elbows have CNC tapped NPT ports
  • Has O-ring seals
  • Weighs 2 lbs
  • Powder-coated exterior


Design: The build of the S&B elbow is rugged yet stylish. The CNC machine unit provides an edged look to a whole new level. The black powder coating on the exterior provides protection against rust and corrosion to the elbow. The mouth-piece is designed with O-ring seals for leak-proof performance. Also, the inlet and outlet external diameter is large enough for effortless placement.

Engine performance: Your vehicle’s engine will perform better than ever with improved power and fuel economy. It claims to increase 78.6% with smooth and unshattered airflow with the designed computational fluid dynamics flow simulation software. The cooler air kit lessens intake restrictions that increase the air velocity to ensure better engine performance.

Permission on roads: This Duramax delete kit does not have permission in California streets as it does not comply with their emission standards. Moreover, the kit releases carcinogenic chemicals such as carbon, methylene chloride, and lead compounds.


  • 5-05 Chevy/ GMC 6.6L LLY DURAMAX 76-1006B
  • Throttle response improves
  • Provides an unrestricted smooth flow
  • Lowers EGTs
  • Installations easily with a larger internal diameter
  • Improves fuel economy
  • Exposes you to certain carcinogenic chemicals

2. Sinister Diesel Billet Valve Covers

To replace your current valve covers with something extraordinary, you can try these Sinister diesel billet valve covers. Apart from having good-quality valves, the covers also contribute to keeping the valve’s long life. Hence, you require less frequent replacements and enjoy a stable increase in your Duramax engine’s performance.

Key features

  • CNC machined
  • Anodized
  • Valve covers include gaskets
  • Weighs 15 lbs
  • Length is 10.5 inches


Design: The design of the valve covers features CNC-flanged machine edges that provide durable long-term usage without replacements. The outer covering is a sinister anodized blue coating that acts as a protective layer against rust and corrosion. Hence, the overall valve’s durability peaked up.

Engine performance: The engine is bound to improve with fuel upgrades and turbo performance than before by clearing the engine bay. You can enjoy full-on engine power with cost-saving on fuel. If you are not satisfied with their performance anytime soon after purchase, then Sinister EGR delete lly promises to buy back the valve covers from you, free of cost. If you find defects in the covers after purchase, you will get an immediate replacement upon call. So, there should be no more doubt regarding the performance!

Installation process: To place the valve covers, you do not require an extra harness or wiring because they already work with the vehicle’s wired harness. The covers come with gaskets of their own and work conveniently with other after-market delete kits.


2004.5-2010 2500-3500 Duramax LLY, LBZ, LMM


  • Durably made for a long-lasting performance
  • Looks stylish with sinister blue
  • Increases engine turbo and fuel economy
  • Easy to install


  • Expensive compared to similar valves

3. Labwork Turbo Inlet Manifold Intake Elbow Replacement

One of the best replacements you can make for your Duramax diesel is Labwork Turbo intake elbow replacement. You will encounter a drastic change in your engine’s performance with improved horsepower and torque. Plus, the engine will always outperform with magnificent power till the intake elbow is there, which will be for a long time.

Key features

  • Powder-coated exterior
  • CNC machined
  • Weighs 2.31 lbs
  • Enables unrestricted airflow
  • Increases 80% airflow


Design: The intake elbow design includes a wider inlet and outlet diameter design for easy fitment on diesel Duramax. Also, the CNC machine edges with powder coating on the outside provide a long-lasting survival and retain the intake elbow’s newness.

Engine performance: You can highly expect an 80% increased airflow to your engine claimed by Labwork, which in return will increase up to 25 hp and torque power. There will be unrestricted, smooth airflow without you having to maintain the elbow frequently. The low EGTS of the elbow keeps the engine cool even under extreme vehicle performance.

Permission on roads: The Labwork elbow intake is not legal to use in California roads due to their inability to meet the emission standards. You have to use it under safety guidance; the kit releases harmful chemicals that affect reproductive organs.


2004-2005 Chevy Silverado / GMC Sierra Truck 6.6L LLY Duramax Diesel


  • Provides smooth airflow to the engine
  • Increases hp and torque of the engine
  • Durable and self-protective
  • Throttle response improves
  • Affordable


  • Not legal in California

4. EGR Delete Kit and High Flow Intake Kit

If you are looking for an EGR delete kit Duramax LLY for your racing car, nothing can replace this one from Maxon Auto. Maxon is reputed for building professional level, high-quality intake kits to ensure your racing car does not lag behind your competitors. Once you install it, you will see the change!

Key features

  • Pressure tested for leakage
  • For the racing purpose only
  • Replaceable with the EGR system
  • CNC machined diesel delete kits
  • Includes all the installation hardware


Design: The elbow design intake EGR delete Duramax LLY kit is a CNC machine billet that is high pressure tested under all circumstances and provides a 100% guarantee for a leakproof performance all-throughout its life. Also, the body is built from stainless steel and durable aluminum for lightweight-ness and self-protection. It means the kit will save itself from rust and corrosion with minor maintenance.

Engine performance: The racing car engine will work with its utmost power with this Silverado EGR delete kit. You won’t replace it with anything once you see the increased horsepower, gas mileage, and torque, which is highly needed by the engine.

Installation: The kit includes every piece of hardware required for proper placement. However, there comes no installation guide, so you require a professional to get it installed. Moreover, this kit is compatible with every EGR system without requiring extra parts.


  • 2004-2005 Chevy Silverado 2500-3500 HD 6.6L V8 DIESEL TURBO DURAMAX LLY, VIN “1, 2.”
  • 2004-2005 GMC sierra 2500-3500 HD 6.6L V8 DIESEL TURBO DURAMAX LLY, VIN “1, 2.”


  • Built for long-lasting use
  • Leak-proof performance
  • Highly compatible with EGR systems
  • Provides high-speed performance to the engine


  • Not for on-road use

5. LLY EGR Delete Kit W/ Intake Elbow Exhaust Gas Recirculation Delete

The fifth on our list is another EGR delete Duramax kit for racing cars to ace on the racing tracks. The delete kit is a premium build one from Alpha dog that claims to outlast all the other engine parts. You will feel its durability only when you take it on your hands because it has a weight that comes from the durable material build of it.

Key features

  • Made of steel and aluminum
  • Includes installation hardware
  • Weighs 1.25 kgs
  • Needs tuner for clearing codes
  • Pressure tested for leakage


Design: This intake elbow DuramaxLLY EGR delete kit is made from robust steel and aluminum, making it irreplaceable for years. Moreover, it also helps to survive pressure for high-speed racings, and prior to handing it over to users, the kit is already high-pressure tested and proves to be leak-proof. The exterior is blue painted to make it look fancy and protects against external calamities.

Permission on roads: This Duramax EGR delete kit is not permitted for on-road use and is highly restricted in California streets. It will be a punishable offense if the kit is seen with pollution-controlled vehicles in California. The EPA Clean Air Act claims this delete kit is illegal on federal, states, or highways for declining emission laws.

Engine performance: For racing purposes, you can expect to enjoy the high-speed performance with your engine. It will keep the engine cool with a high airflow intake system when the engine tends to overheat.


  • 2004 – 2005 6.6L GM and Chevy Duramax LLY Diesel Engines 2500 – 3500


  • Leak-proof EGR kit
  • It keeps the engine cool
  • Made durable with steel and aluminum
  • Easy to install with all the hardware included


  • For the racing purpose only and not for on-road use

6. Turbo Vane Position Sensor Kit

If you are looking for a sensor kit to replace your engine’s management, try this super affordable turbo vane position sensor kit. Just because it is priced low doesn’t mean there is something low on the quality side. The kit is filled with cost-effective solutions for your engine with the original equipment.

Key features

  • Replaceable with 12643471 OE
  • It comes with an adapter harness
  • Weighs 6.4 ounces
  • Has direct fitment
  • Made for the repair environment


Design: This vane position sensor is tried and tested for reliable performance as the kit is built with high-quality materials. The quality is maintained in such competitive pricing, and for this, customers return to this sensor for their diesel engines. You can determine the engine vane on a number of geometry turbochargers as it is designed for such a purpose.

Installation: Installing the sensor will take less than 10 minutes with the adapter harness and other hardware included, and you won’t require any sort of special tools. This sensor has a direct fitting for every compatible diesel engine and does not require any cutting or welding. Moreover, you can replace the sensor easily with the 12643471 OE number.


  • 5-2015 Chevrolet Chevy GMC Silverado Sierra 2500 HD 3500 6.6L
  • 2006 H1 Alpha
  • 2006-2011 LF72 Base DIESEL
  • 2009 R26 UFO DIESEL, V8 403CID 6.6L
  • 2007 W72 Base DIESEL


  • Extremely affordable
  • Compatible with most the diesel engines
  • It has a reliable build
  • Very easy to install


  • Do not have a warranty for defects

7. Coolant Filtration System Sinister Diesel

Another breathtaking piece from sinister is its coolant filtration system for your Duramax engine. The system offers your vehicle long-lasting performance with high reliability, and the price will prove worth it. If not, you know that sinister promises to buy back the product from their customers for free if they are not fully satisfied.

So, trying this amazing piece out won’t lose you anything but outstanding engine power!

Key features

  • CNC machined
  • Aluminum built and anodized
  • Includes all the hardware in the kit
  • Weighs 4.5 pounds
  • Has direct fit and replacement


Design: Sinister LLY EGR delete brings out the most exclusive design on its products with high-quality materials, and this coolant filtration is no exception. The filter blocks are made from 6061 Aluminum along with a CNC machine, which provides thrilling engine power while keeping it cool when overheated. In this way, LLY EGR delete benefits your engine’s life. Also, the hose is made from silicone that prevents leak-proof performance under pressure.

Engine Performance: Your Duramax engine will offer you quality performance for a long time which you can rely on. To keep the coolant performing like this, make sure you clean the pipe once in a while. It is also one of the best LBZ Duramax EGR delete kits.

Installation process: If you have prior knowledge, then this kit’s fitment will prove a breeze with all the included hardware. However, no installation guide is included, so you may want to call a mechanic for not messing up, even though the fitment and replacement are direct.


  • 2001-2010 GM Duramax 6.6L LB7, LLY, LBZ, LMM


  • Improves engine’s throttle performance
  • Improves brake life and smooths acceleration
  • Easy to fit and replace
  • Offers durability and reliability for a long-term performance


  • Costly delete kit

8. PCV Re-Route Hose Adapters Duramax Diesel

If you are looking for a hose adapter for your Duramax diesel engine, then nothing could be more reliable than this one from XJDAMZ. The adapter is made from high-quality, durable materials to last long and has easy fitment with the hardware included.

Key features

  • Made from aluminum alloy
  • Built-in O-rings
  • Provides lifetime service warranty
  • Weighs 10.8 ounces


Design: The adapters are manufactured with durable and lightweight aluminum alloy that helps to reroute the PVC hose from the intake tube. These won’t break or crack in the longest time, plus they will remain free from rust for their lifetime.

Installation: Manufacturers ask for professional installation help for these adapters. The two adapters come with O-ring seals that ensure even tighter installment. Also, XJDAMZ provides lifetime service to their customers for tension-free usage.


  • 5 – 2010 Duramax LLY LBZ LMM 6.6L


  • Very affordable
  • Easy fitment
  • Made durably
  • Includes all the installation hardware


  • Has limited compatible fitment

9. Diesel Care Duramax EGR Delete Kit & High Flow

The last best EGR delete kit for llyDuramax on the list is the diesel care Duramax delete kit from DCP. You can highly rely on its job for keeping your Duramax engine cool and powerful even after a high-speed performance. This kit is worth every penny for long-term improvement in the engine’s life.

Key features

  • Includes all the hardware
  • Aluminum and steel build
  • Provides High flow intake
  • Leak-proof with O-rings
  • Pressure tested


Design: It is designed with high-quality aluminum and steel that provides longevity and reliability overall. This EGR delete for Duramax kit is designed to clean soot buildup in the valves and increase the airflow. Moreover, it is also pressure tested and equipped with O-ring seals for leak-proof performance.

Engine performance: You will see an improvement in brakes, smoother acceleration, and improved torque upon installing the kit. Your Duramax engine’s longevity will increase with this EGR delete kit Duramaxas it will keep the engine stable and cool during high performances.

Permission on roads: The kit does not have permission for sales in California for breaching emission laws. You will face a punishable fine if you are caught on the streets or highways with this EGR delete kit, and it is only made for racing purposes.


  • 5-05 Chevy GMC 6.6L Diesel LLY Duramax


  • It keeps the engine soot-free and cool
  • Provides leak-proof performance
  • Provides perfect fitment
  • Easy to install with the hardware


Expensive compared to similar products

LLY EGR Delete Kit Detailed

Deleting the EGR of your vehicle is always a preferable choice over replacing it from time to time. It will lower the temperature of your engine, provide you with better fuel economy, and also, as an advantage, you may even get better horsepower too!

But don’t get your expectation too high to the sky right now. Deleting the EGR may give you some hassles too as your state’s laws don’t permit doing it. Are you confused by now? Don’t worry. We are hoping that by the end of this article, you will easily be able to decide what to do. Stay till the end.

What does LLY stand for on Duramax? 

Basically, there is no connection between LLY and Duramax. You cannot break LLY down to Duramax in any way. LLY is just the RPO (Regular Production Code) code that refers to “Duramax Diesel Engine.” It’s similar in the way AN3 means ‘power front bucket seats’ and U2K means ‘satellite radio’.

Every time a Duramax diesel engine gets its upgrade, the RPO code changes. The first Duramax engine’s name or version was 6.6L LB7. Then it changed to 6.6L LLY. Afterward, the versions were named 6.6L LBZ, 6.6L LMM, 6.6L LGH, 6.6L LML, 6.6L L5P, and 3.0L LM2 respectively.

LLY EGR delete Benefits

LLY was the second generation Duramax engine. The first, LB7 didn’t have any proper emission system within it. LLY was thus the first in terms of emissions system containing the EGR. We all know what an EGR is, don’t we? There are plenty of benefits of deleting the EGR of your vehicle, namely-

It will increase fuel economy

The working process of EGR requires more fuel to keep your vehicle on road. EGR redirects the exhaust gasses back to your vehicle’s engine. That’s why the engine has to take more workload and it consumes more fuel.

If you remove the EGR system from the engine, the engine will get more breathing space. And then the engine will give better output with less fuel. Because the engine is now free from the workload of EGR.

It will potentially lower the temperature of your engine

The engine burns the exhaust gasses again when the EGR sends these gasses to the engine. In this way, the temperature within the Engine rises and becomes very hot. It will significantly harm the engine of your vehicle. So, it’s better to take the EGR off to keep your engine cooler.

Your vehicle’s engine will perform better

As we mentioned earlier, by having more breathing space, the engine will work more efficiently. Because it will no longer have to deal with the exhaust gasses sent back to it. So, if you remove the EGR valve from your engine, you will have the chance of getting better performance from the engine.

You won’t have to go to the mechanic frequently

The EGR valve is very likely to fall into failure. It is quite expensive to do the EGR-related repairs. And if you do not maintain the EGR properly, you are of no good having it. Due to the EGR, sometimes your engine will fall into problems too. Now it’s your choice. Either you protect your environment (as the politicians promise) or you protect your pocket.

LLY EGR Delete kit install process

Most probably, you will have a user manual with the 6.6L LLY EGR delete kit. The user manual will instruct you about the installation process. But if you don’t have any or if you unknowingly threw it in the bin, we are here for you. The installation process is briefly mentioned below-

# Step 1: Disconnect batteries

The first thing you need to do is to disconnect the batteries. It will protect you from any potential electric problem.

# Step 2: Drain coolant

After disconnecting the batteries, you have to drain the factory coolant. You will find disgusting soot over there just to find the necessity of draining it.

# Step 3: Remove the intake resonator by untying the hose clamp

You will have to remove the intake resonator after draining the coolant. You have to do it by slackening the hose clamp. After the hose clamp, you have to loosen up the support bolt too.

# Step 4: Untie the hose clamp and remove

After removing the intake resonator, you have to loosen hose clamps from the intake tube and remove them.

# Step 5: Remove zip files and pull wiring away from the intake manifold

Then you have to remove zip files and pull wiring away from the intake manifold to continue the process.

# Step 6: Remove the bolts

After removing zip files, you have to remove the 4 bolts holding the intake to EGR and also the 2 bolts to the intake crossover. Then you have to loosen the hose clamp on the boost tube and remove the intake manifold.

# Step 7: Remove PCV hose

In this step, you have to remove the PCV hose on the passenger side of the truck.

# Step 8: Remove the bolts on the exhaust side of the EGR cooler

After removing the PCV hose, you have to remove 4 bolts and nuts on the exhaust side of the EGR cooler.

# Step 9: Remove the bolts holding the EGR

Then you have to remove the 4 bolts and nuts holding the EGR to the motor. After the removal of bolts, you have to disconnect the hoses on the front and back of the cooler and then pull the entire EGR assembly up and out.

# Step 10: Pre-assemble the intake tube

After removing the EGR assembly, you have to pre-assemble the intake tube with the 2 blue anodized plates. You can use 3 short bolts and 1 long blot here.

# Step 11: Re-install the intake tube

Now, you have to re-install the intake tube with supplied stainless steel support bracket and nut to the long screw on the intake tube block-off plate. Make sure to reuse the factory bolt to mount the stainless steel bracket to the engine.

# Step 12: Install exhaust block-off plate using the bolts

After completing step 11, you have to install a polished stainless exhaust block-off plate using two 20mm and two 30mm bolts.

# Step 13: Install supplied hose in place of the factory EGR cooler

Then, you have to install the supplied hose from the firewall to the front of the motor. It must be installed in place of the factory EGR cooler.

# Step 14: Reinstall everything back on

Now, you have to re-assemble everything back on. Re-install the intake, boost tube, intake resonator, PCV hose, wires, etc. nicely as they were in the first place.

LLY EGR delete check engine light

Will EGR delete on your LLY Duramax cause of check engine light (CEL)? Well, it depends on your vehicle’s emission system. The common emission systems are-

  • Federal Emissions (short form- FE9)
  • Northeast Emissions (short form- NE1)
  • California Emissions (short form- YF5)

If you have one of the FE9s, then most likely you won’t get any codes while unplugging. Even on 06/07 Classics, you can unplug the EGR and have no codes. But the rest in the list will throw CEL code. You may fix this problem using your Edge or inserting a finger stick.

LLY EGR delete kit y-bridge

What is a Y-bridge for  LLY EGR delete kit? It is an intake kit for the LLY (2004.5-2005) Duramax. Generally, this kit is provided with the engine. Keeping the factory Y-bridge is not a good idea, however, even if you want to keep it, you can’t. Within a short period of time, the factory Y-bridge will blow apart.

The stock Y-bridge is structurally very weak. Under heavy load and boost, it won’t last long. So it’s better to replace it with an aftermarket one. You may replace the Y-bridge together with the EGR delete kit. Thus, you won’t have to open up your engine twice.

LLY EGR delete kit instructions

Deleting the emission system of a vehicle is never an easy task. To complete this task to perfection, you will have to follow several basic instructions. The LLY EGR delete instructions may be stated as follows-

Check the Package of your delete kit

Usually, any delete kit comes up with all the necessary tools and equipment you are going to need. But you should always check the package. It shall contain the following-

  1. 30mm long bolts (3)
  2. 20mm short bolts (5)

i. Two worm drive clamp (hose clamp)

  1. One 3/4″ × 17″ silicon hose
  2. One intake support bracket (304 SS)
  3. One M8 Nut

ii. One Billet Stainless exhaust block-off

iii. Two Billet EGR block-off plates with o-rings

Try to understand the disclaimers

Almost every delete kits will contain the following disclaimers-

i.Deleting the EGR will void your vehicle’s warranty

ii.You will have to use your deleted car only for the off-road purpose

Do not install the delete kit on a used vehicle

It won’t be a good idea to install the delete kit on your used vehicle. As the engine will be pretty hot by that time, you may seriously injure yourself by touching the parts of the engine. At least give one hour to the engine to cool off.

Follow the installation process precisely to get your job done

If you are comparatively familiar with your truck’s engine and fix the minor problems by yourself, then installing the LLY EGR delete kit won’t be a big issue. But you must have to follow the steps provided with the delete kit. Otherwise, you may fall into a world of problems. You don’t want that to happen, do you?

LLY EGR Delete tuner

As we previously mentioned, it depends on the emissions system you do have in your vehicle. If you have any emissions system other than the FE9, it will throw codes after the removal of the EGR. And you will need a tuner to get rid of this problem. What will a tuner do? It will modify the engine’s computer so that it functions properly.

Besides, you may even pass an ordinary police inspection if your vehicle functions properly and doesn’t throw codes frequently. There are many good tuners available in the market. You can buy one according to your need and budget.

LLY EGR delete pipe

Experts recommend installing the up pipes at the same time of installing the Y-bridge kit. There are two types of up pipes-

  1. Passenger side up-pipe
  2. Driver side up-pipe

The stock-up pipes are very vulnerable to failure. During heavy towing or boosting, there’s a high chance of the failure of those up pipes. The modification of up pipes is considered a very necessary one while removing the EGR of your vehicle or replacing the Y-bridge.

However, you should not use a blocker plate instead of new up pipes. The blocker plates will get destroyed after a while anyway. There are many aftermarkets up pipes available. Experts recommend the 2″ SS stainless up pipe. The stainless ones are very durable in this regard.

That’s why you should always consider buying an LLY EGR delete kit with the up pipe. It will relieve you from opening your vehicle’s engine more than once.

LLY EGR delete kit blocker plate

There’s an alternative to the EGR delete. You can install a blocker plate instead of removing the EGR of your vehicle. Well, you shall not do it if you are not on a tight budget. What does a blocker plate do? Its work process is pretty simple. You put it in the EGR valve and it blocks the exhaust gasses to get redirected to your vehicle’s engine. Sounds good, right? But it has some major disadvantages that may be stated as follows-

The blocker plate will be broken eventually

It doesn’t matter how durable the blocker plate you have is, it will be broken eventually. Because the blocker plate cannot hold the huge pressure of emission gasses. Over time, it will break, and remain within the EGR valve, which will create major problems for your vehicle’s engine in the long run.

Without a hole, the engine will throw an error code

Most of the time, the blocker plate needs a little hole inside it to dodge the engine’s computer. If you don’t do it, your vehicle’s engine will continuously throw error codes. And you must know how frustrating that is.

You won’t get the benefits of a full EGR delete

Bypassing anything won’t give you the full potential out of it, never. That’s why it is a bypass. After a full EGR delete, your vehicle will get more breathing space, you will get better fuel economy and most likely you are going to get a slightly better horsepower.

LLY EGR Cooler

The LLY Duramax has a bad reputation for overheating. You will find the tiniest radiator and fan in the LLY of the Duramax series. They are not enough to keep the temperature of your truck down. Though there are several other reasons for overheating your vehicle.

Air restrictions of the EGR are very severe and so the heat cannot come out. As a result, the engine remains hot. And if you pair your LLY Duramax truck with a heavy trailer or very hot temperature, most likely the stock cooling system won’t perform well. If you leave these temperature issues unchecked, it can result in serious problems in the long run.

Most of the time, the engine face overheating problems due to other common LLY issues. Facing head gaskets problem and water pump failure problem are the most common of them. You have to address these issues out before spending money on an aftermarket EGR cooler.


LLY has the first EGR among the Duramax models. The EGR system came up along with a stock cooler and EGR valve. What’s the function of an EGR valve? It determines when and how much exhaust gas is recirculated into the intake manifold. Because you don’t want to shoot hot exhaust air into the engine, do you? Though the EGR valve is supposed to control this matter, it fails frequently.

For this reason, you have to continuously go to repair shops. Or, you can simply remove the EGR system with an EGR delete kit. Though you may bypass the EGR system with a blocker plate, it is not recommended. If you have the budget, go for the full EGR delete.

LLY EGR delete problems

Why are you deleting the LLY EGR? For your benefits, right? Especially, to save some money. But deleting the EGR will also provide you with some problems that may be stated as follow.

It will void your vehicle’s warranty

Facing a hefty amount of fine due to passively supporting the removal of the emission system is the least your truck’s dealer wants. Besides, you may throw your engine into a world of trouble in the process of deleting the EGR. And trust me, none of the dealers will tolerate it. So, deleting the EGR will surely void your vehicle’s warranty. You have to keep that in your mind.

You have to use your truck only for the off-road purpose

In the United States, removing the emission system is only permitted for racing or competition purpose. That’s why you cannot use a deleted vehicle for street use. You have to use the deleted vehicle for the off-road purpose only. If you use your deleted truck on street anyway, you are most likely facing a huge amount of fines.

Error codes for not deleting with a tuner

Most of the trucks will require a tuner to keep your truck’s engine believing that everything is okay. Otherwise, the engine will constantly throw error codes. There are only a few old models out there that don’t require a tuner to keep everything under control. If you have one, you are a lucky man, mate!

Which is better- LB7 or LLY? 

Why do manufacturers release a new version? To give something new to the consumers. Both LB7 and LLY have their advantages over one another. As there were no proper emissions systems in the LB7 (it had a catalytic converter), it has better fuel economy and it will give you more mileage than the LLY.

But the LLY is quieter than the LB7. This is a deal-breaker feature. Besides, EGR was first introduced to the LLY of the Duramax series. Thus you are getting a better emission system if you care about the environment. Though the LLY is a little bit sluggish until it is spooled, it has no turbo lags.

We have tried to state all the advantages and disadvantages of both the LB7 and LLY. Now, it’s your choice which one you are going to buy. But if you want us to recommend one, we will tell you to go for the LB7 for its more mileage and better fuel economy.

Read EGR Problem of a 60 series Detroit Engine.6.7 Powerstroke EGR Delete Problems 6.4 Powerstroke EGR Delete Problems and 6.7 Powerstroke Delete Kit.

FAQ on LLY EGR Delete Kit

What is the benefit of EGR delete on Duramax?

The emissions systems of diesel engines, especially the EGR always had a bad reputation. You are likely to have a better fuel economy, more mileage, and a slight improvement in horsepower. Besides, the engine lifespan will significantly improve by the removal of the EGR.

Does EGR delete increase horsepower Duramax?

Well, it does. Though you may not notice the improvement, EGR delete improves the horsepower of your Duramax engine very slightly. As the engine will have more breathing space, it will perform better than before and you may get slightly more horsepower because of it.

Does EGR delete increase fuel mileage Duramax?

Yes. Your Duramax engine will have more fuel mileage after the removal of the EGR. As the engine will work more efficiently, you will get increased fuel mileage on your Duramax diesel engine.

Will EGR delete cause black smoke?

No, it won’t. As the EGR redirects exhaust gasses back to the engine, removing it means giving more life to your vehicle’s engine. Thus it decreases black smoke rather than causing it. So, you do not need to worry about causing black smoke while deleting the EGR.

Is EGR delete worth it?

It depends. If you intend to use it for the off-road purpose only, then spending your money is worth it. Otherwise, it isn’t. Because using a deleted truck on street will put you at risk of facing a hefty amount of fine.

Is EGR delete illegal?

In every state of the United States, it is illegal to remove any part of the vehicle’s emission system. So, yes. It is illegal to delete the EGR of your vehicle. You may face up to $22,000 as a fine for removing the EGR.

Does EGR delete make louder?

An EGR delete may make your truck louder. Though some of the deleted truck users stated in some forums that they haven’t faced any issue. But most probably your truck will sound louder when it sits idle. You won’t face the problem while driving down the road though.

Does EGR delete affect mot?

In 2021, yes. The MOT test (Ministry of Transport) is an annual test that is done to ensure vehicle safety. If you tamper with any emission part of your vehicle, and the MOT tester notices it, you are going to fail the test.

How many miles will an LLY Duramax last?

A typical 6.6L Duramax can easily hit the 350k miles provided with proper maintenance. Though they claim that the Duramax can hit up to 400k-500k, it is paperwork, right? And a Duramax will last that long only if you provide it with super good maintenance. However, due to the bad emission system, your LLY won’t last that much. You can expect to get 250k miles on average.


So, this was it for my review of Duramax EGR delete kits that are worthy of your investment. You will see a drastic improvement in your vehicle with any of them as they belong to some of the reputed motor part manufacturers. Though these are shown for EGR delete kit LLYDuramaxcompatibility, you can always check the fitment for your specific vehicle in Amazon Garage before you purchase.

The main bar against the EGR removal is the legality of it. It is purely illegal to remove any part of the vehicle’s emission system. But the laws aren’t much effective in all the states. If your state doesn’t care much about it, you can delete your truck without any hesitation.

Besides, for race and competition purposes, it’s legal to delete. But if your state is strict to the laws, then you may think twice before deleting the EGR. Hope you’ve made your decision at this point. If you have any further questions, leave them in the comment box.

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