When the Going Gets Tough MBRPinc's XP Series performance exhaust systems have proven their ability to stand up to the toughest conditions - on and off the road. The rugged nature of an MBRPinc XP Series performance exhaust is no accident. Thick sixteen gauge T409 stainless steel tubing won't rust through. Solid, reinforced welds at vital stress points make certain that your system stays secure. After millions of miles logged by tens of thousands of MBRPinc customers we back this system with a Lifetime Warranty.