I am a new owner, help me!, I cant find performance parts Options

[95CelicaST]

I am looking for performance parts for my ST. I am assuming it has the 7AFE engine (same as 93-97 corolla) but specifically I am looking for an exhaust system. Can you help me? Thanks.

[Negative]

I take it you are looking for bolt-on stuff, in which case you should have bought a different car. I have the GT but if you look at my profile most of the stuff I have besides the header will be possible for your car as well. Most of the time I make my own mods or just modify mods from other cars - whatever. It's obviously more time consuming but I usually like the results better and I take pride in hand modifying my car.
As for the exhaust the best thing to do would be what playr158 said and have a custom 2.25 exhaust made for your car. We got pretty good results out of my friends 4A-GE (something of the predecessor to your engine) powered Geo Prism GSI (Geo-Rolla) by just upgrading the spark plugs, spark plug wires/distributer cap, added a 2.5 inch short ram intake and a universal muffler on the stock piping. Mostly you will gain throttle response etc. Don't look for huge gains out of your 7A unless you plan to do what Frotou is doing with his 7A turbo set up.
Also one thing to remember is that your Toyota was already impressively setup with good intake (restrictive but cold at least) decent sized exhaust piping (at least on the GT's), plugs and wires were stock Denso (same as NGK) etc. so the gains will be less than on some other cars that have really crappy stock set-ups.
Good luck.