Performance 3" Exhaust Turbo Down Pipe 2011 to 2015 Chevy/GMC Silverado Sierra 2500 3500 6.6L Duramax Diesel Pickup Truck 2011-2015 Chev/GMC 2500/3500 6.6L Duramax Diesel Pickup Truck (EXCLUDE MODEL WITH FLANGED DOWNPIPE) 3" Turbo Down Pipe, Black Coated Finish Gains of +21 HP and +24 lb/ft Torque Greater Heat Retention. 20% Greater Flow Over Stock. Richer Diesel Sound Part Included: 1 Down Pipe Only, Exactly As Shown In Picture Above