2017-2026 GM / Chevy Duramax L5P 6.6L Parts

What’s Listed on This Page

• Full Delete Kits — Complete DPF, DEF, and EGR removal kits for 2017–2019, 2020–2023, and 2024–2025. The 2017–2019 and 2020–2023 kits ship with an ECU unlock tool, OBD-II flash interface, tuning credits, 5-tune SOTF package (0HP to +150HP for added horsepower), EGR delete kit, CAN Communication Plug Kit, and a stainless steel DPF & CAT delete pipe. Exhaust options include 4-inch or 5-inch T409 stainless steel — straight or with muffler. Air intake filter available as add-on. The 2024–2025 6.6 Duramax delete kit includes ECU unlock hardware and 8 tuning credits but is limited to a single tune at factory power level. All kits fit Chevy and GMC pickup trucks only.
• DPF & CAT Delete Pipe — 4 inch stainless steel delete pipe replacing the factory diesel particulate filter and catalytic converter section on the 6.6 Duramax L5P. Available straight or with muffler, and with or without a downpipe add-on. Standalone product — not paired with an L5P exhaust system.
• L5P EGR Delete Kit — EGR delete pipes, exhaust block-off plates, gaskets, and hardware. Covers 2017–2025 Chevy Duramax and GMC Duramax pickups in one kit.
• ECU Unlock Tools & Tune Packages — L5P delete tuning on this platform uses ECU unlock tools with flash calibration — no traditional plug-in tuners exist for the 6.6L Duramax L5P. Separate tools for 2017–2019 and 2020–2023, each with SOTF support and multiple power levels. Standalone SOTF tune packages also available for owners who already have the unlock tool. Unlocked TCMs sold separately — T87A for 2017–2019 (Allison 6-speed) and T93 for 2020–2023 (Allison 10-speed).
• Exhaust Systems — 4-inch and 5-inch T409 stainless steel exhaust systems for 2017–2025. Both available as straight pipe or with muffler. All bolts, clamps, and hangers included. The 4-inch exhaust has an optional downpipe add-on at checkout. A standalone 3.5-inch downpipe is also available.
• Performance Accessories — S&B cold air intake for improved airflow and turbo response on this high-performance L5P diesel. FASS Titanium Signature fuel system for consistent fuel delivery under tow. Polished stainless steel Black Bandit exhaust tip in 4-inch and 5-inch. Harness Plugs Kit (2011–2021) covers exposed connectors after removal. CAN Bus Plugs (2020–2023) for tuning and diagnostic access. These accessories work with or without a full Duramax DPF delete kit.

Key Features and Benefits of the L5P Duramax Delete Kit

• No more DEF heater failures or forced regen limp mode
• Cleaner intake manifold without EGR carbon buildup
• Faster turbo spool from reduced exhaust backpressure
• Lower risk of CP4.2 fuel system issues under higher flow

Supported Models

• 2017–2019 6.6L L5P Duramax (Chevy Silverado / GMC Sierra 2500HD & 3500HD )
• 2020–2023 6.6L L5P Duramax Chevy Silverado / GMC Sierra 2500HD & 3500HD 
• 2024–2026 6.6L L5P Duramax Chevy Silverado / GMC Sierra 2500HD & 3500HD 

Not sure which L5P Duramax delete kit or part matches your truck? Call, email, or WhatsApp us with your year and VIN — we’ll figure out what works for your build. These performance parts are for off-road use only. Check your local regulations before purchasing or installing.