2020-2026 GM / Chevy Duramax 6.6L L5P
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EGR Delete | GM Duramax Diesel L5P 2020-2025
Original price was: $429.$299Current price is: $299.
L5P 3.5″ Down-pipe 2020-2025 GM Duramax
Original price was: $467.$357Current price is: $357.
2020–2026 GM 6.6L L5P Duramax Delete Kits & Performance Products
This page has every L5P Duramax delete kit and performance upgrade we sell for 2020, 2021, 2022, 2023, 2024, 2025, and 2026. All products fit Chevy Silverado 2500HD/3500HD and GMC Sierra 2500HD/3500HD pickup trucks – with ECU tuning split between 2020–2023 and 2024–2026 model years due to GM’s updated ECU security.
What Ships from This Page
- Full Delete Kits – Complete DPF, DEF, and L5P EGR delete kits with ECU unlock hardware, tuning credits, and T409 stainless steel exhaust options.
- DPF & CAT Delete Pipe – 4-inch stainless steel delete pipe that replaces the diesel particulate filter and catalytic converter section. Standalone part for duramax DPF delete kit builds where the rest of the factory exhaust stays in place.
- L5P EGR Delete Kit – EGR delete pipes, block-off plates, gaskets, and mounting hardware. Removes the EGR cooler and valve to stop carbon buildup in the intake.
- ECU Unlock Tools – HP Tuners-based ECU unlock tool with OBD-II flash interface and SOTF tune support for the 2020–2023 chevy Duramax. Standalone tune packages available for 2020–2026.
- Exhaust Systems – 4-inch and 5-inch T409 stainless steel exhaust systems. Both available as straight pipe or with a muffler. The 4-inch has an optional downpipe add-on selectable on the product page. A standalone 3.5-inch stainless steel downpipe is also available.
- Performance Accessories – S&B cold air intake for improved air intake flow. FASS Titanium fuel pump for fuel delivery protection. Black Bandit polished stainless steel exhaust tip. Harness Plugs Kit and CAN Bus Plugs.
Key Features and Benefits L5P Duramax Delete Kit
- No more DEF heater failures or forced regen limp mode.
- Cleaner intake without EGR carbon buildup.
- Better fuel economy from unrestricted exhaust flow.
- Faster turbo spool under heavy tow loads.
Supported Models
- 2020–2023 Chevy Silverado / GMC Sierra 2500HD & 3500HD 6.6L L5P Duramax.
- 2024–2026 Chevy Silverado / GMC Sierra 2500HD & 3500HD 6.6L L5P Duramax.
GM tightened ECU security on 2024+ – the 2020–2023 SOTF tune packages and unlock tools won’t work on the newer trucks.
Not sure which L5P Duramax delete kit or exhaust fits your GM diesel? Call, email, or WhatsApp us with your year and we’ll confirm fitment and compatibility before installing anything. These kits are for off-road use only. Check your local laws before purchasing.
FAQ
The biggest difference is ECU tuning capability. The 2020–2023 kit includes a full 5-tune SOTF package with power levels from 0HP to +150HP - you can switch between them on the fly. The 2024–2025 kit is limited to a single fixed emissions-off calibration without SOTF power switching support because GM locked down the ECU security on those trucks. The ECM also has to be shipped to HP Tuners for unlocking on the 2024–2025 - that service isn't included in the kit. Delete pipes, EGR hardware, and exhaust systems are the same across both groups - it's the tuning side that changes.
The 2020–2023 L5P with a full SOTF tune package sees up to +150HP at the top power level. Torque climbs with it - the Allison 10-speed responds well to the higher calibration. Throttle response sharpens noticeably, and the turbo spools faster without the DPF restriction. The 2024–2025 trucks are currently limited to a single fixed emissions-off calibration without SOTF power switching support - the delete still removes the DPF, DEF, and EGR hardware, but you won't see the same horsepower gains until higher-level tunes become available for that ECU.
You'll see better fuel economy primarily because the engine isn't running forced regen cycles anymore. The factory aftertreatment system creates additional exhaust restriction, especially during active regeneration cycles - removing it lets the engine breathe. Most L5P owners report 2–3 MPG improvement on highway. Short-trip drivers who dealt with constant regens notice it most. Running a +150HP SOTF tune aggressively won't save fuel - it'll make power instead.
The delete pipe and exhaust are bolt-on jobs from underneath - most owners handle that part without trouble. The EGR delete requires more patience - the bolts sit tight between the intake manifold and the block. The ECU unlock process involves connecting the HP Tuners tool via OBD-II and flashing the calibration - it's software-driven, not mechanical. Plan for a full day if you're doing everything together. Every kit ships with detailed instructions, and we're available by phone if you need fitment help during the install.
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The team went above and beyond to make sure I received my order. Easily one of the best customer service experiences I’ve had in years.
Completely satisfied.
The muffler is compact, flows well, has a deep tone, and produces no drone at highway speeds.
Muffler eliminated cab drone while keeping a strong exhaust note. Good balance for daily driving.
The Optimal Flow 5-inch muffler arrived quickly and looks well made. It seems like a good balance to keep noise reasonable when towing. Planning to pick up the remaining components soon.