[atari]

I would think it would depend on the motor you have. If you have a JDM motor, a JDM part would perform nicer, I would think. If you had something like the k20a3, something that isn't used very much in the JDM market, a USDM part would perform better. Now if you had a k20a2, a DC5 JDM integra motor, a JDM part would suit better.

Performance is one of many things that could be looked at in the world of JDM vs. USDM. The cosmetics is another thing. JDM styling is by far different looking than the USDM stuff, that is all in just preference on what you think looks nice. Myself, I like the JDM look, but thats just me.