Table of Contents

Which Duramax Is in Your Silverado/Sierra?

Chevy and GMC used the same 6.6L Duramax across the Silverado HD and Sierra HD lines, so the engine code matters more than the badge on the tailgate. Each generation added emissions hardware, and that hardware decides what a delete involves.

Quick generation guide: LBZ, LMM, LML, L5P by year

Engine Model Years Emissions Hardware Delete Scope
LBZ 2006 to 2007 EGR only EGR delete
LMM 2007.5 to 2010 EGR + DPF DPF + EGR delete
LML 2011 to 2016 EGR + DPF + DEF (SCR) Full DPF + EGR + DEF delete
L5P 2017 to 2024 EGR + DPF + DEF (SCR) Full delete + special tuner

The easiest way to confirm your engine is the 8th digit of your VIN. A "D" points to the LBZ, a "6" to the LMM, an "8" to the LML, and a "Y" to the L5P. The RPO sticker in the glovebox gives you a second check.

Older trucks fall outside this guide. The LB7 (2001 to 2004) has no DPF or DEF system and only a vacuum EGR on California trucks, and the LLY (2004.5 to 2005) has EGR only, so their parts lists look different from the four generations above.

One more warning on year breaks. The 2007 model year splits into two engines: the LBZ runs through the early 2007 trucks, and the LMM starts at 2007.5. If your truck was built in 2007, confirm the engine code before you order.

What Delete Means for Your Silverado or Sierra

A diesel delete removes emissions equipment from the truck and replaces it with off-road hardware and, in most cases, a tune. On a Duramax, that can mean the EGR valve and cooler, the DPF, and the DEF (SCR) system, depending on the generation. It is not a single part. It is a package of hardware and calibration that has to match your engine.

Emission system removal for off-road use

Delete parts are sold for off-road, race, and non-public-road applications where permitted. Do not assume an off-road label protects a road-certified truck. Federal law treats the truck as a motor vehicle regardless of how you use it, and tampering can lead to civil penalties for owners, shops, and sellers. Some states also test heavy-duty diesels with OBD readiness checks or smoke opacity tests, and a deleted truck will not pass them. If you are not sure your use qualifies, stop and confirm before you buy.

Performance and reliability improvements

Owners look at deletes for practical reasons. The gains they chase include:

  • Reduced exhaust restriction and improved exhaust flow
  • Less soot and heat routed back through the intake on EGR-equipped engines
  • Fewer regen cycles and fewer DPF and EGR related codes
  • Better throttle response and towing confidence when the truck is tuned properly

Results depend on the truck, the kit, and the tune, so no honest seller can promise a set horsepower or MPG number. What you can count on is a simpler exhaust and intake path when the parts match your engine.

Choosing the Right Delete Kit by Generation

Match the kit to your engine code, model year, and cab and bed layout. Delete pipes are sized to your wheelbase, so cab style and bed length matter as much as the year.

LBZ (2006 to 2007): EGR delete only

The LBZ has no DPF and no DEF system, so an EGR delete is the main job. You are looking at an EGR delete kit with an intake elbow or block-off plate, plus a CCV reroute if you want to address crankcase vent buildup. It is the simplest of the four generations and a common first project.

LMM (2007.5 to 2010): DPF + EGR delete

The LMM added a DPF, so the job grows to a DPF delete pipe and an EGR delete. There is no DEF system on this engine. Choose a kit that lists the LMM by name, and check whether your setup calls for a 4-inch or 5-inch pipe, with or without a muffler.

LML (2011 to 2016): full DPF + EGR + DEF delete

The LML carries all three systems: EGR, DPF, and DEF. A full delete removes the DPF, the EGR cooler and valve, and the DEF hardware, and it needs matching tuning. Kit contents vary between LML packages, so read what is in the box before you buy, including clamps, gaskets, and hardware.

L5P (2017 to 2024): full delete + special tuner

The L5P is the most involved of the four. It has a full emissions stack and a locked factory ECM. On 2017 to 2023 trucks, the NOx sensors and DEF module talk to the ECM over the CAN bus, so unplugging them without the right CAN bus connector can throw network codes and send the truck into limp mode. Those trucks also need a tuning platform built for the L5P. For 2024 and newer trucks, the newer ECM and electrical architecture usually rules out standard handheld tuning, and the ECM may have to be removed and sent out for a bench unlock. That adds cost and downtime. Look at the product page for your exact year range, and send your truck details to support if you are on a crossover year.

What Does a Silverado Delete Cost?

Cost depends on the generation, the pipe size, the finish, and whether a tuner is bundled. The ranges below are typical estimates, not quotes. Check the live price on the product page before you plan your budget.

Parts cost by generation

Generation Typical Parts Range What Moves the Price
LBZ About $150 to $500 EGR kit only, or EGR + CCV
LMM About $500 to $1,300 DPF pipe size, muffler option
LML About $1,200 to $2,800 Full kit, tuner bundle, pipe size
L5P About $1,500 to $3,200 for 2017 to 2023 Tuning package, downpipe, CAN bus connector. 2024 and newer trucks add a paid ECM unlock, so confirm current pricing

Bundled kits often cost less than piecing parts together from several sellers, and they cut the risk of a missing clamp or gasket.

Labor if shop-installed

Shop rates vary by region, and a diesel shop may quote a flat price for a delete job. Plan on roughly these hours:

  • LBZ: 3 to 5 hours
  • LMM: 6 to 10 hours
  • LML: 8 to 12 hours
  • L5P: 10 to 14 hours, plus tuning setup time

A shop bill can match or pass the parts cost on the LML and L5P. If you install it yourself, use jack stands, let the exhaust cool fully, wear eye protection, and plan for stuck bolts on older trucks. Get professional help if the job is beyond your tools or experience.

Tuner Requirements by Generation

A delete without the right tune can leave you with check engine lights, limp mode, or a truck that runs poorly. Removing the EGR also changes combustion temperatures, and if injection timing and fueling are not adjusted, exhaust gas temperatures can climb fast enough to damage pistons, valve seats, and the turbo. Sort out tuning before the first bolt comes off.

Generation Tune Needed? Notes
LBZ Recommended Handles EGR related codes and calibration after the delete
LMM Yes Needed to address DPF and EGR calibration
LML Yes Must cover DPF, EGR, and DEF
L5P Yes Usually needs ECM unlock and an L5P-specific tuning platform

You have two main paths: a handheld tuner with pre-loaded tunes, or a custom tune loaded through a platform such as EZ Lynk. Handheld options are simple and quick. Custom tunes give you more control over towing, fueling, and transmission behavior. Browse the current Duramax tuner lineup and match the platform to your engine code, since a tuner for one generation will not work on another.

Common Questions from Silverado/Sierra Owners

Will it affect my tow rating?

A delete does not change your truck's rated capacity. Your tow rating comes from the frame, axles, brakes, and cooling system, and the numbers on the door jamb and in the owner's manual stay the same. What can change is engine output, and a tuned Duramax puts more load on the transmission and driveline. Stay within your rated limits, watch your transmission temperatures, and keep your brakes and tires in good shape.

What about extended warranty?

Check your contract before you touch anything. Many aftermarket service contracts can deny claims tied to modified emissions or engine control systems, and a dealer can decline repairs it links to a modification. GM dealers can read the ECM calibration data, and a flash back to stock does not always hide a past tune, so do not count on a flash back to protect a claim. Older LBZ, LMM, and LML trucks are usually past factory powertrain coverage, but a late-model L5P may still be covered. Ask your provider in writing what a delete does to your coverage, and decide with that answer in hand.

FAQ

Is a Duramax delete legal? Do not treat any emissions-related product as legal for a road-certified truck. Federal law covers the truck even when it is used off-road, and some states run OBD and smoke opacity inspections that a deleted truck will fail. These parts are sold for off-road, race, or non-public-road use where permitted, and you are responsible for confirming compliance with federal, state, and local laws.

Which Silverado or Sierra Duramax is the easiest to delete? The LBZ, because it only needs an EGR delete. The LMM adds a DPF, and the LML and L5P need full DPF, EGR, and DEF work with matching tuning.

Do I need a tuner with a delete kit? On the LMM, LML, and L5P, yes. On the LBZ, a tune is recommended. The L5P also usually needs an ECM unlock, and 2024 and newer trucks may need a bench unlock service.

Will a delete pipe fit my cab and bed? Fitment depends on year, engine, cab style, bed length, and any prior exhaust changes. Check the compatibility notes on the product page and confirm your setup before ordering.

How fast can I get the parts, and what if I order the wrong kit? Most orders are processed the same or next business day, excluding Sundays, and many packages arrive within 3 to 5 business days after leaving the warehouse. Free shipping applies within the continental United States. Authorized returns are accepted within 45 calendar days of delivery for unused, uninstalled, unmodified parts in original condition. Tuner and electrical items can carry stricter return limits.

Before You Order

Run through this list first:

  • Confirm your engine code (LBZ, LMM, LML, or L5P) and exact model year
  • Note your cab style, bed length, and current exhaust setup
  • Decide on pipe size and muffler or no muffler
  • Pick your tuning path before you buy hardware
  • Read what is in the box, including clamps, gaskets, and bolt sets
  • Confirm your intended use is off-road, race, or non-public-road where permitted

Not sure which kit matches your truck? Send your year, engine, cab, bed, and any prior modifications to the diesel parts specialists at EngineGo and get fitment confirmed before you check out.

Legal Notice

Emissions-related products are intended for off-road, race, or non-public-road use only, where permitted. A vehicle originally certified for road use remains subject to the federal Clean Air Act and state rules, even when it is used off-road. Removing or altering emissions equipment can violate federal, state, and local laws and can lead to civil penalties, failed inspections, and denied warranty claims. Customers are responsible for confirming legal compliance before purchase and installation. Professional installation is recommended where appropriate.