Wehrli 11-15 Chevrolet 6.6L LML Duramax 3in Stainless Down Pipe (V-Band Style)Replace the restrictive crushed factory down pipe on your 2011 2016 LML Duramax with this full 3" Stainless Steel down pipe. For use with factory turbo or factory style drop in turbo on trucks using a v band connection style exhaust, NOT the 3 bolt flange style exhaust. Replaces the following GM Part Numbers: 12643610, 12638304, 12643214 Note: For 3 bolt style down pipe use PN: WCF100705