MBRP 11-13 Chev/GMC 6.6L Duramax 3in Turbo Down Pipe BlackMBRP 11 13 Chev GMC 6. 6L Duramax 3in Turbo Down Pipe Black Replace that restrictive factory downpipe with a MBRP direct replacement downpipe for more flow, fuel economy, and better performance. Removal of OEM catalytic converters may be a violation of emissions laws in your jurisdiction. Ensure that the intended use of this product is permitted. Not for sale or use in the state of California. Armor BLK Turbocharger Down Pipe; 3 in.; Black Coated; 4