Mustang SCT XCalibrator 2

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If you have 17" wheels then you dont have a speed limiter, but those GT's that came with a 16" wheel usually had an H rated tire which those did come with a speed limiter.

The Mustang has a rev limiter that can be adjusted by the tune of the Xcal2. However if you don't have heads and cams with the proper valvetrain, dont increase it. You will fack up the motor.