5″ GM LB7 LLY LBZ w 6.6L Duramax 2001-2007 with muffler

This appears to be a downpipe or exhaust system designed for 2001–2007 Chevrolet Silverado & GMC Sierra 2500/3500HD trucks equipped with the 6.6L Duramax LB7, LLY, or LBZ engines. Here’s a breakdown of the details:

Key Features:

• Fits: 2001–2007 Chevy Silverado & GMC Sierra 2500/3500HD (pickup models only—not Cab & Chassis).

• Engine Compatibility: LB7 (2001–2004), LLY (2004.5–2005), LBZ (2006–2007).

• Allows removal of catalytic converter & DPF (for off-road use only—not street legal in most areas).

• Bolt-on direct fit—uses OEM hangers for easy installation.

• Includes everything needed (gaskets, clamps, hardware, etc.).

• 5″ diameter piping for improved exhaust flow.

• Includes a muffler (unlike some straight-pipe kits).

Notes:

• Off-road use only—removing emissions equipment (DPF/cat) is illegal for on-road vehicles in the U.S. under federal law (EPA regulations).

• Performance benefits: Reduced exhaust backpressure, potentially better turbo spool, and increased horsepower/torque.

• Sound: Will be louder than stock, but the muffler helps control drone compared to a straight pipe.

Installation:

• Should be a straightforward bolt-on job if replacing the stock downpipe.

• May require lifting the truck for easier access.

Would you like recommendations for tuning or other supporting mods to maximize performance after installing this exhaust?