BMW F8X M3 & M4 Active Autowerke Rear Exhaust Section

F8X BMW M3 & M4 REAR EXHAUST SECTION The Active Autowerke F8X rear exhaust was carefully engineered to eliminate the unflattering sound of the factory M3 and M4 exhaust, while also allowing for optimum flow and resonance. Every effort was made in addressing the not so appeasing sound of the stock OEM exhaust, but in designing an exhaust worthy for an "M" car. The rear exhaust combined with our mid-pipe offers the deepest sound and best performance of any other system on the market today.  Available for both models, this axle-back exhaust gives your BMW the deep, throaty, growl a car of its caliber should have had from the factory! KEY FEATURES Made in the USA 18+ WHP gain over stock* 30+ LB-FT gain over stock* Quicker turbo spool Low, Deep Rumble Flex joints to reduce vibration Double-canned muffler to reduce resonance Each exhaust test-fit on our F8X Exhaust Fixture Guaranteed to fit all F80 BMW M3/F82 BMW M4 Includes all necessary installation hardware