TruckTok 2015.5-2016 Chevy/GMC Duramax LML 4" DPF & CAT Delete Pipe

FITMENT

• 2015.5-2016 6.6L Silverado & Sierra Duramax 2500HD/3500HD LML engine models with the 3-bolt flange.
  
• Does NOT Fit 2011-2015.5 model with the V-Band Clamp style. 
• Please physically inspect underneath truck to verify your turbo discharge style before purchasing!

DESCRIPTION

Product Overview

• Late-model 15.5-16 Duramax LML trucks pack incredible factory performance, but the heavy, triple-layer emissions network (DPF + DOC + SCR/DEF) wrapped under the chassis acts like a breathing stranglehold.
• Over time, permanent ash accumulation completely chokes the filter ceramic bricks, triggering relentless and fuel-heavy Active Regeneration cycles.
• This chokes your fuel economy to a painful 13-14 MPG, spikes your towing EGTs past 1,300°F, and puts high structural stress on your turbo charger, frequently causing Limp Mode.

Key Features

• Mandrel-Bent Flow: CNC mandrel-bent 4" T-409 SS tubing ensures smooth, high-velocity exhaust flow. Completely unrestricted with No Bungs to interrupt the air path.
• Massive Mileage Recovery: Stops fuel-heavy active regeneration cycles permanently. No more wasting expensive diesel fuel just to forcefully bake an empty factory ceramic filter.
• Absolute Backpressure Relief: Swapping out the choked factory DPF/CAT/SCR sections drops backpressure to zero, letting hot exhaust gases escape instantly to lower critical EGTs.
• Precision-Engineered 3-Bolt Flange: Crafted with a heavy-duty, CNC machine-cut 3-bolt flange that guarantees a seamless, direct leak-free connection to 15.5-16 turbo downpipe outlet.

FAQ

Q: What is the difference between pipe "With Muffler" vs "No Muffler"?

A: This pipe replaces only the DPF and CAT sections to connect to your factory muffler. The Pipe replaces both sections and adds a high-flow muffler. If your stock muffler is old or rusting after nearly a decade, the all-in-one kit is the perfect replacement.

Q: Can I pair this 15.5-16 3-Bolt Flange delete pipe  with the 11-15.5 Downpipe？

A: No, absolutely not. This downpipe features a V-band clamp outlet for early-generation setups, while the 15.5-16 late-model delete pipe requires a triangular 3-bolt flange downpipe connection. They will not bolt together.

Q: How much mileage recovery can I expect?

A: Most owners see a massive jump. While a clogged DPF drops fuel economy to 13–14 MPG due to frequent regeneration cycles, deleting it restores combined mileage to 18–19 MPG under normal driving conditions (oversized tires or heavy towing will lower this).

Q: What is the main structural difference between these two exhaust systems?

A: The 4" Race pipe is a mid-section pipe replacing only the factory filters under the cab while reusing your stock tailpipe for quiet comfort. The 5" DP-Back is a full  straight pipe that replaces entire exhaust from the turbo to the rear bumper for maximum flow and raw V8 volume.