Replacing Tunes with SCT X4 Tuner

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4/14/17, 08:41 AM

tourer

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Join Date: July 30, 2012

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Replacing Tunes with SCT X4 Tuner

I have an X4 Tuner, Last year 2016 I had a Steeda 93 Octane tune installed to it and then my Mustang GT, I'm installing more mods this spring. Steeda will be sending me a tune via e-mail for my latest upgrades. My question is, Do I have to return the car to the STOCK tune first, before I install the new 2017 Tune?