2017-Present Silverado/Sierra 2500HD/ 3500HD L5P Duramax 6.6L, Armor BLK 3.5-Inch Down-Pipe, MBRPEnhance your Chevrolet GMC 2500HD 3500HD L5P by installing the MBRP GM8436 Down Pipe. This direct replacement down pipe features 3 5 inch mandrel bent tubing, has exhaust wrap pre installed, and boasts a ceramic black coating. This down pipe is designed to enhance your truck's performance, as the GM8436 demonstrated up to an 11 percent increase in flow compared to stock and a weight reduction of 3lbs. Upgrade your truck today with the MBRP's GM8436