Question?

i have a 1997 eclipse rs and a greddy evo 2 cat back exhaust system and greddy headers and i was wondering do i need to buy anything else to make them fit on?

there is a greddy evo catback for a n/t...interesting, no you dont need anything else might wanna do the intstall at a performane shop just incase you need odd and end parts..should just bolt up my magnaflow did on my gs

Yes there is a evo and evo2.
Damn that evo2 is going to sound awesome.

All you need is lots of wd-40/pbblaster and maybe a breaker bar.