Exhaust Muffler Tips for Ford Mustang (2011-2014) 5.0L 5.4L V8High Flow Axle Back Muffler Delete for 2011 2014 Ford Mustang Designed to eliminate factory exhaust restriction, this axle back muffler delete reduces exhaust backpressure to optimize throttle response, increase torque, and deliver an aggressive V8 exhaust note. The Stock S197 Exhaust Restriction The factory axle back exhaust system on the 2011 2014 S197 Mustang utilizes heavily baffled, chambered mufflers designed primarily for NVH (Noise, Vibration,
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Exhaust Muffler Tips for Ford Mustang (2011-2014) 5.0L 5.4L V8