Performance 4" Aluminized Steel Downpipe Down Pipe Back Race Exhaust Kit System For 01-07 Chevy/GMC 6.6L Duramax Turbo Diesel Pickup Truck Fit: 01-07 Chevy/GMC 2500HD/3500 6.6L Duramax Diesel, Ext & Crew Cab, Short or Long Bed 2007 Classic Model Only. Excludes 2007 New Body Style 4" Turbo Back Performance Exhaust System (Front Pipe Included) Mandrel-Bent For Maximum Performance Simple Bolt On Hangers