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 6.6L Duramax LML introduced General Motors' complex DEF system alongside the traditional DPF and CAT assemblies. This massive mid-body emissions unit creates extreme thermal heat behind the turbo, triggers frequent fuel-wasting active regens, and causes costly DEF fluid/heater sensor failures that put your work truck into speed-restricted Limp Mode.
- The 4" LML DPF, CAT & SCR Delete Race Pipe is the ultimate performance mid-pipe solution for Duramax LML trucks. this straight race pipe replaces all restrictive mid-body emissions components. By restoring unhindered exhaust flow, it sharply lowers towing EGTs, improves throttle response, unlocks 2–3 MPG gains, and restores that deep, iconic Duramax V8 turbo whistle and rumble.
Key Features
- Premium Materiall: Full 4-inch mandrel-bent T409 SS tubing built to resist severe thermal stress, road salt, and harsh off-road rust.
- Sharply Drop Towing EGTs: Removes intense turbine backpressure right behind the downpipe, allowing hot exhaust gases to flush out rapidly to lower EGTs under heavy loads.
- Permanently Stop DEF System Errors: Eliminates failure-prone DEF pumps, heaters, and fluid sensors that trigger automatic 55-MPH dealer Limp Mode lockouts.
- Eliminate LML Emissions Restrictions: Completely replaces the heavy, choked factory DPF, CAT, and SCR (DEF system) mid-section with a high-flow 4-inch straight race pipe.
FAQ
Q: What do I do with the DEF (Diesel Exhaust Fluid) tank after installing this race pipe?
A: Once your ECM is flashed with a delete tune, the DEF system is electronically deactivated. You can leave the empty DEF tank mounted under the truck, or completely remove the tank and fluid lines to save extra weight and free up underbody frame space.
Q: Do you recommend pairing this race pipe with an EGR Delete Kit?
A: Highly recommended. While this race pipe frees exhaust backpressure, an EGR Delete Kit stops hot, soot-heavy exhaust gases from entering your intake manifold. Combining both keeps intake air cool and clean, prevents valve soot buildup, and offers 360-degree engine protection for your LML.
Q: Do I need to reinstall factory EGT sensors or DEF injectors into this pipe?
A: No. This is a smooth, bungless straight-pipe design. Once your ECM is properly tuned for a delete, these sensors are electronically disabled, allowing you to unplug the harnesses, zip-tie them safely to the frame, and cap the connectors to protect against moisture.
