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.

Dinan Dinan Free Flow Axle-Back Exhaust - 2011-2016 BMW 550i D660-0036-BLK

Specifications:

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This Part Fits:

Year	Make	Model	Submodel	Notes
2011	BMW	550i	Base
2012	BMW	550i	Base
2013	BMW	550i	Base
2014	BMW	550i	Base
2015	BMW	550i	Base
2016	BMW	550i	Base
2011	BMW	550i xDrive	Base
2012	BMW	550i xDrive	Base
2013	BMW	550i xDrive	Base
2014	BMW	550i xDrive	Base
2015	BMW	550i xDrive	Base
2016	BMW	550i xDrive	Base