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
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On 6.6L Duramax LML engines, dual-path airflow restriction and chronic internal coking limit overall performance. The OEM DPF canister generates severe backpressure that traps heat behind the turbocharger, while the combined EGR and CCV circuits vent abrasive exhaust carbon and oil vapor directly into the intake tract—forming a sticky sludge that coats intake valves and reduces volumetric efficiency.
- Delivering a total air-handling overhaul, this LML 4" DP-Back Exhaust, EGR Delete & CCV Reroute Package liberates your engine’s breathing path from turbo to tailpipe. The mandrel-bent 4" exhaust relieves backpressure and lowers EGTs, while dedicated EGR block-off and CCV reroute hardware isolate soot and crankcase oil from your charge-air system—preserving intake cleanliness and throttle response under heavy towing.
Key Features
- Matches the early LML’s V-band clamp connection so the pipe seats directly against the factory downpipe flange.
- Swaps the DPF for smooth 4" pipe that sheds backpressure and puts a stop to the fuel-draining regen cycles.
- Deletes the EGR cooler and reroutes the CCV oil mist to keep the turbo, intercooler, and intake dry and clean.
- Consolidates the exhaust, EGR, and CCV work into a single teardown around the tight rear engine bay to save shop time.
FAQ
Q: What does the 4" downpipe-back exhaust get me?
A: The 4" system replaces the restrictive factory components to improve flow, cut restriction, and reduce heat buildup under heavy-duty driving for a cleaner, freer exhaust path.
Q: What is the point of the CCV/PCV reroute?
A: It redirects oil vapor and crankcase contaminants away from the intake, which keeps the intake tract cleaner and lets the turbo and intercooler stay drier over time.
Q: Will this kit improve towing performance?
A: Yes. By lowering exhaust restriction and improving airflow, it supports stronger exhaust flow during towing and heavy-load work, helping the engine run cooler and hold power under load.
Q: Does this kit work on cab & chassis trucks?
A: This kit is designed for standard Silverado HD and Sierra HD pickups. Cab & chassis models may require additional modifications and should be confirmed before purchasing.
