4in Pro Series T-304 Front-Pipe Back 01+ GM 6.6L


1 in stock (can be backordered)


2001+ 6.6L 4 Inch Front-Pipe Back, Dual Wall Straight Cut Tip, all cab & bed configurations (Including Dually)
PRO Series

The Duramax has a refined toughness to it. MBRP Inc. Has left the refined part to General Motors, and added extra toughness. The Duramax makes big power gains with the high flow 4" mandrel bent exhaust system. Each system is a direct bolt on application and is manufactured as a full 4" system all the way back to the 5" diameter exhaust tip. Lower EGT (exhaust gas temperature), improved fuel economy along with more towing power are just some of the added benefits of having this system installer on the Duramax.
Crew Cab Long Bed Trucks require Mid-Extension Pipe GMS9403



Additional information

Weight 85.00 lbs
Dimensions 60 × 24 × 24 in


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