Take your exhaust system to the next level with an MBRP downpipe. Replace the restrictive stock pipe with a mandrel bent 16 gauge pipe, coated in tough high temperature ceramic coating. MBRP 4" front pipes will also help your Duramax breath by mating up to MBRP exhausts. The perfect upgrade to make a complete downpipe back system. Both components will help to increase flow which translates into lower EGT's and more power.