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This BBK Mustang Axle-Back Exhaust system features BBK's patented tunable Varitune performance mufflers that allow you to change from a mellow three chamber exhaust sound to a more aggressive straight-through exhaust sound. BBK Varitune performance mufflers utilize an internal "Adjustable Power Valve". When in the closed position the valve blocks the exhaust flow forcing it through all three chambers of the muffler for a classic mellow sound. When in the open position the valve bypasses the chambers allowing it to follow a straight-through muffler path for a rich throaty exhaust note. So now you can open it up for the track and close it down for a roadtrip. This BBK Performance Axle-Back exhaust system features Varitune chambered mufflers that end with 4" polished 304 stainless tips for impressive looks and sound. The tips exit in the stock locations, so no modification to the rear bumper cover is required. Product Benefits 100% stainless steel construction BBK Adjustable Varitune Design 8-10 decibel range difference Direct bolt on 4" polished 304 stainless steel tips




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