BMW 550i Catbacks

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	FI Exhaust Catback Valvetronic Muffler with Quad Tips BMW 550i F10 \| F11 Model \| 4.4L TwinTurbo N63 Engine 11-16 Model Number: FI-BMW-F10\|F11-550i View Price Frequency Intelligent Valvetronic Exhaust System technology offers cutting-edge intelligent ECU exhaust control valve, with an emphasis on the optimization of both acoustics and performance. It is a testament to their philosophy of the ultimate union of comfort and performance experience for the driver and passengers.When the valves are fully open for maximum flow and power, it creates an exotic tone and allows for high performance. When the valves are closed, volume is reduced for a more low-pr...