MBRP 2004.5-2010 Chev/GMC 6.6L Duramax 3in Turbo Down Pipe BlackReplace 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. This Part Fits: Year Make Model Submodel 2004 2005 Chevrolet Silverado 2500 HD Base 2004 2006 Chevrolet Silverado 2500