Funny how I saw this thread and saw an actual race between these 2 cars today. 2 guys I know by my house own a Black Z and a White STI. They always rum at each other etc. and finally got the guy in the Z to stop and chat with the STI guy since I was at his pad playing GT4. From a stop, the STI put 1 1/2 jump on the Z and won by at least 3-4 cars.
From a 40 mile roll, the STI won by about 2 cars. They raced 5 times and same results.
Z Mods- Stillen Exhaust, Intake and lowered
STI Mods- CatBack Exhaust and Intake ( Downpipe is in the garage)