FITMENT
- 2017-2023 6.6L Silverado & Sierra Duramax 2500HD/3500HD trucks.
- Fit Crew Cab, Double Cab, Regular Cab with Standard/Long Bed.
- Does NOT Fit: 3500/4500/5500 Cab & Chassis commercial models.
DESCRIPTION
Product Overview
- The 2017–2023 6.6L Duramax L5P engine feature a massive, highly complex factory emissions system (DPF, CAT, and DEF/SCR) under the cab. As these work trucks age, failure of DEF heaters, DEF pumps, and downstream NOx sensors routinely causes costly dealership repair bills and initiates automatic 55-MPH Limp Mode countdown lockouts.
- The 4" L5P Duramax DPF Delete Race Pipe removes all factory emissions choke points. By restoring smooth, unhindered exhaust airflow, it dramatically reduces towing EGTs, improves throttle response, unlocks better fuel economy, and delivers an aggressive diesel tone—all while retaining your factory rear tailpipe routing.
Key Features
- Heavy-Duty Material: Mandrel-bent 4" T409 stainless steel tubing built to withstand intense exhaust temperatures, road debris, and harsh winter road salt without rusting.
- Maximized Exhaust Gas Flow: Relieves high exhaust backpressure right behind the front downpipe, allowing hot gases to vent rapidly and sharply dropping towing EGTs under heavy payloads.
- Permanently Bypass DEF & DEF Limp-Mode: Eliminates failure-prone L5P DEF injectors, pumps, heaters, and NOx sensors that trigger speed lockouts and endless countdown warnings.
- Retains Factory Rear Tailpipe Layout: Designed as a seamless mid-pipe replacement that connects to your downpipe outlet and hooks directly into your stock rear tailpipe section.
FAQ
Q: Will this 4" L5P delete pipe lower my EGTs while towing?
A: Yes. Deleting the dense DPF and SCR filters eliminates massive backpressure right behind the turbo. This allows exhaust heat to dissipate much faster during heavy towing and hill climbs.
Q: Does this 4" pipe replace my entire exhaust system to the rear bumper?
A: No. This is a Mid-Pipe Delete Pipe. It replaces only the choked emissions section under the cab (DPF, CAT, DEF SCR) while connecting seamlessly to your OEM front downpipe and stock rear tailpipe.
Q: Do I need a custom ECM tune to install this delete pipe on a 2017–2023 L5P Duramax?
A: Yes. The 2017+ L5P requires an ECM unlock and custom delete tuning to turn off the factory DPF regens, DEF system, and NOx sensors. Installing this pipe without a custom tune will immediately trigger limp mode and check engine lights.
Q: Do I need to reinstall factory DEF or EGT sensors into this pipe?
A: No. This is a smooth, bungless straight pipe. Once your L5P ECM is flashed with a custom tune, all emissions sensors are electronically disabled—simply unplug the plug and zip-tie them securely to the frame.
