Dinan 11-16 BMW 550i xDrive Freeflow Axleback Exhaust System - Polished

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. Stainless Steel - Polished Tips - F10

• Quad 3.5" laser engraved, polished or ceramic black exhaust tips
• Uses the factory brackets and hangers for a factory-like fitment
• Drone abatement technologies used to reduce cabin resonance
• More Power: + 10 HP when coupled with engine software
• 100% 304 stainless steel construction
• Enjoyably louder, sportier sound