The Magnaflow 4" Dual Downpipe-Back Aluminized Exhaust Kit 18981 offers the most options when building an exhaust for your 2001-2004 GM 6.6L Duramax. For the racer, it provides a mandrel bent pipe-only exhaust from downpipe to tail pipe complete with all hardware. For the street driver, the CBPK is the basis for a custom exhaust that allows you to purchase and install the converter, muffler and tip of your choice. The Aluminized Custom Builder Pipe Kit Series has a limited 1 year warranty. 

• Material: 4" Aluminized Steel 
• Mandrel Bent Construction 
• System Type: Downpipe-Back  
• Tip Quantity: No Tip Included 
• Exit Position: Dual Exit 
• 1-Year Warranty 

Fitment Note: All Crew & Extended Cabs applies to GM 2500HD/3500HD Pickups. This system is not designed for use on Cab & Chassis models.