what is the greatest achievements you did on your car.

I'm not much on engine builds but would guess if you got it dialed in right you could shave some good time at the track.
Yes. The car, chassis is only built to 9.90. And would love to see it push that mark. (N/A. On gas or any power adder would be cheating.) But I also have learned? You are never as fast as you wished? Lol.