I’ll bet that his drag radials are 15" and not 17", makes a differance with more sidewall. Forget the drag radials for the track and put some et streets on when you go to the track, I was running 17" DR’s and could’nt do any better than a 1.9 60’ and 12.4, put a set of et streets on for the next run and cut a 1.6 60’ and a 11.5 at 117. And this was done on all stock suspention. There are many Cobra’s with the IRS that run mid to low 10’s so with the power your car puts out and a set of et streets you can easily see low 11’s if not high 10’s on your stock IRS and suspention if your driver mod is working.