usdm and jdm h22 parts are interchangable. Bolt-on parts can be purchased from any import performance shop. Check www.honda-tech.com in the Prelude section for more information. PreludeOnline.com is another good resource. You can also find used performance parts at both sites. Like anything in life you get what you pay for, if you want quality made performance parts expect to shell out some cash. I've been into the H-series motors since high school, I've done everything from bolt-ons, to nitrous to turbo. If you have any questions feel free to shoot me a PM and i'll do my best to help answer them.

-Mike