I wolud say sell it and buy a older civic=) hehe but if your happy with it then I would look around for intake and exhuast check out many of the webpages out there keep in mind honda redid the whole engine layout in the new civics so parts are nothing like 2000 and under cars not anywhere near as many
I have seen a video of a turbo 2001 civic so if you have the money I guess you could always custom build a setup =)
check out
www.modacar.com for starters see what they have for it if anything
Jeff