This Magnaflow XL Downpipe Back 4 Inch Stainless Steel Exhaust System fits 2006 2500HD and 3500 Extended Cab Long Bed Sierra and Silverado Duramax Diesels.

MagnaFlow's XL Performance is an entry-level performance diesel system featuring a stainless steel, straight-through MagnaFlow XL Performance Muffler along with mandrel-bent stainless steel tubing.(Tip sold separately.)
• MagnaFlow Performance with a 6-year Warranty.
• OEM-Style Barbed Hangers.
• Giant 5" Polished Stainless Steel Tip Sold Separately

Downpipe-Back: Bolts up to the OEM downpipe flange, yielding substantial gains in horsepower, torque, fuel economy and a lower EGT (exhaust gas temperature).