hey man look, i have an 87 Si and trust me you are not going to find ANY performence parts. the best way to go is to custom build things. Go to a muffler shop and see what kinda piping you can get and stick a universal muffler on there. for intake just get a filter...not sure what to use for the actual intake itself but you can get something for it. Still not satisfiyed? swap with something cheap like a d16 and get performence parts for that.