FITMENT
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2007.5-2010 GMC Sierra 2500 3500 HD 6.6 LMM Duramax Diesel.
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2007.5-2010 Chevrolet Silverado 2500 3500 HD 6.6 LMM Duramax Diesel.
DESCRIPTION
Product Overview
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The 6.6L LMM was the first generation equipped with a factory DPF filter. These early emissions systems suffer from frequent fuel-wasting regenerations, clogged exhaust filters, high EGTs, and sticky EGR valves that risk engine overheating. Worse, oily CCV vapors mix with soot to choke turbo vanes and intake valves in thick sludge.
- The LMM 4" Delete Kit with Performance Tuner fixes these performance bottlenecks. The pre-loaded tuner clears CEL codes and disables regeneration cycles, while the 4" mandrel-bent race exhaust, EGR block-off plates, and CCV reroute eliminate backpressure, lower EGTs, stop carbon sludge, and unlock 130+ HP.
Key Features
- EGR System Removal: Replaces the factory EGR valve with high-flow bypass piping and heavy-duty block-off plates, eliminating soot re-circulation and coolant leakage risks.
- Clean Intake CCV Reroute: Diverts oily crankcase vapors away from the turbo inlet and intercooler, preventing sticky sludge buildup on intake and turbo impellers.
- 4" High-Flow Stainless Exhaust: Upgrades your truck with a heavy-duty 4-inch mandrel-bent SS straight pipe, delivering maximum exhaust flow, a deep V8 diesel growl, and drastically lower EGTs.
- Complete 4-in-1 Duramax Delete: Replaces restrictive DPF/CAT exhaust components, removes the failure-prone EGR valve & cooler, bypasses the CCV crankcase system, and disables emissions diagnostics.
FAQ
Q: What is the advantage of a 4-inch exhaust pipe over a 5-inch pipe?
A: 4" exhaust system maintains optimal exhaust gas velocity for stock to mild tow setups, providing excellent low-end throttle response and a deep, clean diesel tone while keeping highway cabin drone to a minimum.
Q: Why is a CCV (Crankcase Ventilation) reroute necessary on an LMM Duramax?
A: The factory CCV routes oil-mist vapors directly back into the turbo inlet. Over time, this oil coats intercooler boots and combines with soot to choke intake valves. The CCV reroute routes these vapors safely outside your intake system.
Q: Is an aftermarket exhaust tip required to fit the end of the 4-inch exhaust pipe?
A: No. The kit includes a clean-cut stainless tailpipe section ready for use. However, if you prefer a finished custom look, any standard aftermarket tip with a 4-inch inlet will bolt or weld directly onto the tailpipe.
Q: Can I re-install the factory exhaust and sensors later if I need to pass an inspection?
A: Yes. Since this installation requires no permanent frame cutting or wire splicing, all factory rubber hangers, frame mounts, and harness plugs remain intact for a straightforward return to stock.
