im not at all sure what a CXi is. but you can start with getting either an AEM intake - which is costly. or just a K&N drop in filter which will net you just a tiny bit less hp.
Also a catback exhaust setup from Tanabe, GReddy, APEXi, Thermal R&D, Magnaflow, etc etc....
and headers, and you can put some springs on that badboy (or coilovers).
what are you going for? performance or looks? for the most part.....
any way you can take pics of that engine bay of yours?
