Replacing Tunes with SCT X4 Tuner
Thread Starter
Bullitt Member
Joined: July 30, 2012
Posts: 242
Likes: 15
From: Maine
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?
