FITMENT
- 2007.5-2010 6.6L Chevrolet Silverado Duramax LMM 2500HD / 3500HD.
- 2007.5-2010 6.6L GMC Sierra Duramax LMM 2500HD / 3500HD.
- Note: Standard pickup models only. Does NOT fit Cab & Chassis commercial truck frames.
DESCRIPTION
Product Overview
- On 2007.5–2010 6.6L LMM Duramax engines, the OEM passenger up-pipe utilizes a restrictive EGR branch that bleeds off vital exhaust velocity before reaching the turbine wheel. Paired with a cramped factory intake bridge and continuous soot recirculation, this setup restricts charge-air volume, cakes intake runners in thick sludge, and drives up thermal loading under load.
- This LMM Performance Package resolves all three breathing bottlenecks simultaneously. Combining a riserless high-flow up-pipe, a 3" intake elbow, and full EGR block-off hardware, it recovers lost turbine drive pressure, eliminates intake restriction, and delivers uninterrupted cool, clean air for faster turbo spool and lower EGTs.
Key Features
- Replaces the cramped factory intake bridge with a smooth 3" mandrel-bent elbow for maximum intake CFM and faster boost.
- Swaps the passenger up-pipe for a smooth, riserless design that drives exhaust velocity straight into the turbo.
- Removes the heavy OEM EGR cooler for good, ending soot contamination and coolant leak risks.
- Drops turbo lag and EGTs under towing by routing exhaust drive pressure to the turbo while clearing intake bottlenecks.
FAQ
Q: Why include a replacement passenger up-pipe in this kit?
A: The factory passenger pipe carries a restrictive branch riser that feeds the EGR cooler. A smooth, riserless pipe sends all that exhaust energy to the turbo instead, maximizing spool and boost.
Q: Does the 3" elbow sharpen throttle response?
A: Yes. The narrow stock bridge holds an internal EGR throttle plate that causes turbulence. The smooth 3" mandrel-bent elbow removes that restriction for clean, high-volume air to the manifold.
Q: What happens to coolant flow on the LMM?
A: The multi-layer silicone bypass hose redirects coolant around the removed cooler and back into the main loop, keeping circulation seamless with no internal leak risk.
Q: Can I fit the 3" elbow without deleting the EGR?
A: No. The 3" elbow removes the factory EGR throttle valve housing, so it has to go in together with the EGR delete plates as one airflow system.
