I know a guy who says his NSX is quite stock (overbored TB, Taitec exhaust) + Procar special c/f intake snorcle. He did a 12.3 @ 123 mph on 245/40/17 eagle f1 gsd3 street tire. No way with stock engine I told him.......he smiled..... . How much whp are nacessary to get this time/speed. I guess about 370 if not more.