STX Mustang makes 392 whp?!

We had a local tuner shop re-tune and dyno test our 2011 Mustang, which is being prepped to SCCA’s STX class. This car made 367 whp bone stock with 500 imles on the clock but now makes 392 whp with a cold air and a tune. Exhaust is still 100% bone stock, as is everything else. They tweaked the throttle mapping also, so hopefully we can use that power on corner exit without it being an on-off throttle switch. Two autocrosses this weekend, including the National Street Tire Challenge, where we can test the new programming as well as an unusual, new wheel and tire combo. You can read the entire forum update here.

392 whp dyno chart

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