MBRP 4" Downpipe Back Exhaust Systems | 01-07 Duramax

MBRP's 4" Exhaust Systems provide a nice balance of sound with an aggressive tone under load and acceleration without being too loud for towing or longer drives. These systems are complete all the way from the downpipe back and include everything needed for a clean and simple installation. Aluminized VS Stainless These exhaust systems are available both in the standard aluminized steel as well as the upgraded 409 stainless material. The Aluminized is a great cost effective option for those in dryer climates that do not experience extreme weather or heavily salted roads where the stainless option provides a bit more durability for those in harsher conditions. MBRP's Muffler MBRP's muffler's feature a straight through design with virtually no restriction allowing a slight reduction in overall noise/drone without any loss of performance. We generally recommend these for those that are frequently towing or spend a lot of time on the highway. Fitment Note: These kits are designed to work wi