MBRP Performance Exhaust Products: Muffler Delete Pipe. This piece replaces the pipe length that the muffler exists in the MBRP exhaust system. There is always someone who wants to push the limit, someone who wants all the cool parts for their Duramax truck. MBRPinc has a few extra pieces that were designed specifically for your truck. Do you want a more aggressive exhaust note? Its easy, just pick up a muffler delete and bolt it into place. Each unit is a simple install using common hand tools.