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

MagnaFlow's Performance Diesel Systems feature giant, fast-flowing, 4" mandrel-bent stainless steel tubing, and a polished 5" diameter stainless steel tip. The MagnaFlow systems incorporate mirror finished MagnaFlow Performance Mufflers with a straight-through design. You can expect significant gains in horsepower, torque, improved fuel economy and a lower EGT (exhaust gas temperature).
• MagnaFlow Performance with a Lifetime Warranty
• OEM-Style Barbed Hangers
• Giant 5" Polished Stainless Steel Tip

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