On my '93GT I used to own, I ran 245/50/ZR16 BF Goodrich Comp T/A's. I had 3.73 gears and was able to cut 2.03 60' times at the track. From what I hear, that's not bad for a stock mustang.
I had Eibach springs, SSM upper control arms, Alston lower control arms, plus I took out the quad shocks because I had tire to shock clearance problems.
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