well first of all welcome
we're always glad to get newbies! especially prelude ones
as for mods, most people go for intake, exhaust and headers. as for hp gain, it all depends. i honestly don't know too much about specific gains, so i'm not even gonna comment. but when i got my intake in my old civic i did notice quite a bit of a difference. most people do the intake first... and it's usually AEM cold air. so i'd recommend that as your first mod. anyone else??