RPi developes the first straight through exhaust design for the X5M and the X6M. Exhaust systems from other competitors tend to "chamber" their mufflers because of the lack of space in the rear of the X5M and X6M. Expect 10-15hp and a great sound. All RPi exhausts are made with T304 stainless steel and come with our limited lifetime warranty.
BMW E70 X5M / E71 X6M