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 is the benefit of getting this "With Muffler" version instead of a straight pipe?
A: Both versions maximize flow and lower EGTs equally. However, this kit adds a straight-through performance muffler to eliminate harsh exhaust rasps and highway cabin drone for a quieter ride.
Q: Does the included performance muffler restrict exhaust flow or increase EGTs?
A: No. The muffler features a full 4-inch straight-through internal core. Exhaust gases pass through without restriction or backpressure, allowing your turbo to cool down rapidly while smoothing out the sound.
Q: Why doesn't this kit include a replacement front downpipe flange?
A: It is intentionally designed without a flange so you can reuse your factory downpipe flange. Reusing the factory flange guarantees a precise, 100% leak-free OEM fitment without requiring aftermarket flange adapters.
Q: Will this 4" pipe connect directly to my factory rear tailpipe?
A: Yes. It is engineered as a direct mid-section replacement that connects to your factory downpipe outlet and bolts seamlessly into your stock rear tailpipe section using heavy-duty clamps.
