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
- Internal thermal cracking in the factory LMM Duramax EGR cooler poses a constant threat to your engine’s head gaskets and cylinder integrity. As the stock cooler degrades under heavy thermal load, hidden coolant leaks can enter the combustion chambers, causing severe engine damage and costly teardowns.
- Upgrade to this LMM Duramax EGR Delete Kit to completely remove the failure-prone EGR cooler and soot-recirculating loop. By eliminating the risk of internal coolant leaks and feeding your engine clean, uninhibited air, it stabilizes cooling performance, protects vital head gaskets, and delivers complete peace of mind on and off the road.
Key Features
- Seals the intake ports leak-free for the long haul — even under high boost — thanks to CNC-machined, anodized black billet aluminum construction.
- Locks carbon soot and valve-clogging gunk out of the intake manifold, helping the engine run cleaner and cutting wear on valves and internals.
- Wipes out the leak-prone factory EGR cooler for good, closing the door on internal coolant-to-exhaust leaks and the expensive head gasket failures they cause.
- Cuts engine running temperatures by keeping hot exhaust gas out of the cooling system, easing thermal stress along the entire cooling path.
- Burns clean air instead of dirty exhaust gas to lift MPG and performance — most owners report an immediate 1–3 MPG gain, especially under heavy loads.
FAQ
Q: What is the purpose of the included U-shaped coolant hose?
A: Removing the EGR cooler disrupts the factory coolant circuit. The heavy-duty silicone U-hose cleanly bridges the open lines, maintaining proper cooling system circulation, stabilizing pressure, and ensuring your cabin heater continues to function perfectly.
Q: Is intake manifold removal required to install this kit on an LMM Duramax?
A: No. Unlike earlier LLY models that require pulling the intake Y-bridge, the LMM’s EGR assembly is positioned higher up near the passenger side firewall. While working space near the cowl is snug, you can complete the installation without dismantling the intake manifold.
Q: Can I keep my factory exhaust after installing this EGR delete kit?
A: es, this kit works seamlessly with your stock exhaust system. However, upgrading to a 4" or 5" performance exhaust later is highly recommended—it drastically reduces Exhaust Gas Temperatures (EGTs) by up to 200°F and significantly improves turbo spooling.
Q: How does the LMM EGR system differ from the 2006–2007 LBZ system?
A: Mid-2007 EPA emissions regulations required the LMM to recirculate a significantly higher volume of exhaust gas. As a result, the LMM features a much larger EGR cooler and an added intake throttle valve, both of which are absent on the simpler LBZ engines.
