fuel components consist of ur injectors, fuel rail, fuel pump, fuel regulator, filter, etc "just in case in forgetting something" lol, with a n/a engine ur probably not gonna have to upgrade any of this honda uses over rated parts in their fuel setups, with a crx ur not gonna get a direct bolt in swap but u can get a special mounting kit for that particular engine probably run u about 350$, but unless u want a h22 prelude engine in a rex u wont have to hack the frame or nething severe like that, just wont fit on ur stock motor brackets