Dinan Free Flow Stainless Steel Exhaust w/ Black Tips -BMW 550i 2015-2011 550i xDrive 2015-2011

Stainless Steel - Black Tips - F10; 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 in. polished or ceramic black tips for a tasteful high-performance look.;