Whether you've blown out the bellow on your passenger side up-pipe or recently deleted the EGR on your 2001-2016 Duramax the Dirty Diesel Customs DUR-EXH-A020 Up-Pipe is the best solution out there. It's guaranteed to last and comes built with high-performance bellows, stainless steel CNC-cut flanges, and mandrel-bent stainless steel tubing.