you can use a speedcal on 96-98 mustangs with a auto or 5 speed and on 99+ mustangs with a 5 speed. only and I got that info from the guy that invented the speedcal
__________________
RUN IT STAIGHT AND RUN IT HARD
________
Novi 2000
60' 1.46
1/4 10.67
mph 126.5
_________
|