Just my 2 cents:
1. Leave it stock and save the money for HPDE, trackdays and autoX. Don't bother with drag racing -- they don't do your Evo any favours and they don't make you a better street driver.
and/or
2. MR Bilsteins, fuel pump, boost gauge, custom tune, TBE, and (1) above. That's really all you need.
I used to think I was a good driver. A track evening with an instructor by my side taught me otherwise. Now I believe that a fast (and experienced) driver is more important that a fast car
