jdm yard or shift performance here in sydney have been the best experiences ive had with the civic. u got heaps of options in terms of mods

i rkn go for the js racing exhaust. ask ekdez he's a member here selling his js racing titanium catback which costs quite a bit brand new think hes selling for a good price so u may be in luck .

only other performance thing i would recommend is an intake but thats just for sound purposes, u wont get that much out of it with just the intake. other things to do which are more worth it are aesthetic mods =P. body kit, rims, coils, etc? what colours the car? welcome btw =]