All depends what type of turbo etc etc. My friends with a gt30r would of destroyed any stage 2 sti. Tuned or not.(the sti). He was also 1 car behind a viper once and beat a z06 off a roll (c5). Oh btw, stock internals on a 1.8t which is much more stronger then a ej20 or ej25. Of course 1st and 2nd gear were just useless.