MBRP XP Series 5" Filter-Back Exhaust System (Single Sided) 2011-2019 Duramax 2500/3500MBRP XP Series exhaust systems are designed to stand up to the toughest conditions, on and off the road. Their rugged, thick, 16 gauge stainless steel tubing won't rust through. They feature solid, reinforced welds at vital stress points, making certain that your system stays securely mounted. The MBRP XP Series mufflers and pipes deliver a rich, mellow exhaust note and are finished off with a mirror polished, stainless steel, rolled edge exhaust tip.