I had my muffler off and GAINED torque before with the stock pipes, actually a noticeable amount. You wont lose it thanks to the VVEL and the size of the motor. Stock pipes are tiny and the cats are restrictive as is, just gains here to be had.
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2013 Ford Mustang GT
374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd
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