FITMENT
- 2011-2015.5 6.6L Silverado & Sierra Duramax 2500HD/3500HD LML engine with a V-Band Clamp.
- Does NOT Fit 2015.5-2016 models equipped with the 3-bolt flange. Please check underneath your truck!
- Please physically inspect underneath your truck to verify your turbo discharge style before purchasing!
DESCRIPTION
Product Overview
- The factory configuration on 6.6L Duramax LML engines is designed for emissions compliance, but the DPF system can create additional exhaust restriction and increase heat management demands under heavy load. At the same time, the factory EGR system recirculates exhaust gases back into the intake system, which can contribute to soot and carbon buildup over time.
- The LML 4" DPF Delete Pipe & EGR Delete Package combines a race pipe with EGR delete components. helps improve exhaust flow efficiency, reduce system restriction, and simplify the factory emissions configuration for off-road and competition applications where permitted.
Key Features
- Optimized Fast Turbo Spool: The 4" pipe diameter maintains ideal exhaust gas velocity for faster turbocharger spool-up, crisp throttle response, and minimal cab drone.
- Reduces EGTs & Ends Active Regens: Replaces the heavy, restrictive DPF canister with a smooth 4" race pipe to eliminate primary exhaust backpressure and stop fuel-draining regenerations.
- Stops Intake Carbon Sludge & Coolant Leaks: Completely removes the factory EGR cooler, preventing abrasive soot from choking intake valves and eliminating internal coolant leak risks.
- Tailored flange Fitment: Features precision V-clamp flange geometry engineered specifically for the downpipe connection layout on early-build LML trucks.
FAQ
Q: Why replace the factory DPF system?
A: Replacing the factory DPF eliminates severe exhaust backpressure and active regeneration cycles, drastically lowering EGTs while improving fuel efficiency, turbo spool, and engine longevity.
Q: How do I choose between the Downpipes?
A: GM changed the downpipe flange mid-2015, so match your build date: 11–15.5 models require the V-band flange downpipe, while 15.5–16 models use the 3-bolt flange downpipe to connect directly to their corresponding race pipes.
Q: What should I do with the factory EGT and NOX exhaust sensors after removing the DPF?
A: After completing the required vehicle setup, the factory EGT and NOx sensors may no longer be used. To protect the exposed wiring connectors from moisture, corrosion, and debris, using a Harness plug kit to keep the factory harness clean and weather-resistant.
Q: Will my truck blow excessive black smoke after deleting the DPF?
A: Under normal driving and modest street/towing tuning, your exhaust will remain clean with minimal smoke. Excess black smoke (unburnt fuel) only occurs under heavy acceleration if you run aggressive, high-power race tunes with excess fuel delivery.
