I have a 2002 s2000 which I love and Love the way it drives. I haven't done ANYTHING to performance or suspension. Do you think the whiteline brace gives the biggest difference? I don't planning on doing s strut bar or adding larger front and rear sway bars,

 

brace seems to make my 05 more stable when going over rough roads, like railroad tracks. Otherwise, it protects my oil pan. Not a huge handling difference.

sway bars would make a much larger difference.

 

Stiffer front swaybar is the best bang for the buck.