
For BMW 550i 11-15 Free Flow 304 SS Axle-Back Exhaust System w Quad Rear Exit
Overview:Dinan's Free Flow Axle-Back Exhaust improves exhaust flow by reducing back pressure, resulting in increased power output and a great sporty sound that is civilized when you want it to be and pleasantly aggressive under harder acceleration with zero drone. 100% stainless steel construction and exacting specifications ensure that the system fits correctly using the factory hangers and will resist corrosion for years to come. A vacuum controlled butterfly valve is utilized to improve flow at wide-open throttle while keeping things civilized and "drone" free throughout. The design reduces overall weight as well and features 3.5'' polished, or ceramic black, tips for a tasteful high-performance look.Features: More Power: + 10 HP when coupled with engine software Drone abatement technologies used to reduce cabin resonance Enjoyably louder, sportier sound Quad 3.5" laser engraved, polished or ceramic black exhaust tips 100% 304 stainless steel construction Uses the factory brackets a