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
- Factory Duramax LMM engines face heavy airflow bottlenecks and soot contamination. The OEM passenger up-pipe bleeds off turbo drive pressure through a restrictive EGR riser, while the narrow stock intake bridge chokes airflow and floods the engine with hot, abrasive exhaust soot that clogs intake runners and spikes EGTs.
- The LMM Package solves all three issues at once. By combining a riserless up-pipe, a complete EGR delete with 3" intake elbow, this kit maximizes drive pressure, eliminates intake restrictions, and keeps your engine running cooler with clean, dense air.
Key Features
- High-Flow LMM Intake: Replaces the restrictive factory intake bridge with a smooth 3" mandrel-bent elbow, maximizing intake CFM for faster boost spooling and sharper throttle response.
- High-Flow Passenger Up-Pipe: Replaces the stock passenger up-pipe with a smooth, riserless design—dramatically increasing exhaust velocity directly to the turbo housing.
- EGR Cooler & Valve Removal: Permanently eliminates the heavy OEM EGR cooler assembly, stopping abrasive soot contamination and removing the risk of internal coolant leaks.
- Faster Turbo Spool & Reduced EGTs: Directing of exhaust drive pressure to the turbo while removing intake bottlenecks drastically reduces turbo lag and drops EGTs under heavy towing.
FAQ
Q: Why does this LMM kit include a replacement passenger-side up-pipe?
A: The factory passenger up-pipe features a restrictive branch riser that routes exhaust gas to the EGR cooler. Replacing it with a smooth, riserless up-pipe channels of exhaust energy directly to the turbo, maximizing spool speed and boost pressure.
Q: Will installing the 3" intake elbow improve my truck’s throttle response?
A: Yes. The factory intake bridge is narrow and houses an internal EGR throttle plate that causes severe airflow turbulence. The smooth 3" mandrel-bent elbow removes this restriction, delivering clean, high-volume air straight to the intake manifold.
Q: How does this kit affect coolant flow on the LMM engine?
A: The included multi-layer silicone coolant bypass hose safely redirects coolant away from the removed EGR cooler back into the primary engine cooling loop, ensuring seamless coolant circulation without any risk of internal coolant leaks into the engine.
Q: Can I install the 3" intake elbow without deleting the EGR system?
A: No. The 3" high-flow intake elbow completely eliminates the factory EGR throttle valve body housing. It must be installed together with the EGR delete plates as a unified airflow system.
