TruckTok 2017-2023 6.6L GM DURAMAX L5P 4" Downpipe Back DPF Delete Pipe

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 Duramax L5P is heavily choked by two factory bottlenecks: the restrictive under-cab DPF/CAT filter blocks and the rough, narrow 3.5" downpipe directly behind the turbo. Over time, these components plug with ash, triggering frequent, fuel-guzzling regeneration cycles that drop mileage to a poor 12–14 MPG. Additionally, the fragile L5P emissions network is highly prone to DEF heater, pump, and NOx sensor failures that instantly trigger a 55 MPH Limp Mode countdown. Forcing exhaust through these combined restrictions traps intense backpressure, spiking towing EGTs past 1,300°F and shortening turbo life. Key Features Industrial-Grade T-409 Stainless Steel: Crafted from heavy-duty mandrel-bent T-409 SS to withstand intense thermal expansion and contraction cycles without cracking, warping, or scaling. Continuous 4" Mandrel-Bent Tubing: Engineered with smooth, uniform 4-inch diameter paths featuring zero internal neck-downs or restrictive bungs,…