What's a good online store that has aftermarket performance parts for my car?

I have a 1997 Nissan Altima SE with a 2.4L DOHC 4-cyl engine and 5-spd manual gearbox. but i'm not sure if it's what they call a SR20 or SR20DET engine or anything of that sort but i am wanting to do some simple modding(body kit, muffler, turbo, cold air intake, shocks & strut brace, etc) but i can't seem to find any good websites just googling for parts for my car. I've even tried ebay but i was only able to find taillights and not very many body kits. Any links would be helpful, also f you have a 97 altima se and know a thing or 2 about them let me know. Thanks!