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If you've been searching for a truly high-performance Axle-Back exhaust for your M3 look no further

making the larger bore of the Dinan high flow versions enable the engine to breathe better for more horsepower and torque

A vacuum controlled butterfly valve is utilized to improve flow at wide-open throttle while keeping things civilized and 'drone' free throughout

This was the case regardless of testing conditions (single/multiple gear pulls

3 L - Crew Cab - GM Fullsize Truck 2009-13 - Kit

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