It should fit on the car, you wont need to buy anything else but the muffler if you dont want to. I would go ahead and get either a custom 2.5" exhaust made at the same time, but with that muffler you could always just do that later. Since it is a straight flow muffler it should be both louder and give more of a performance gain. Hell, I wish I had known about these being so cheap on Ebay, I would have gotten one of those instead of my GST muffler. Its just not loud enough for me

Toney
'97 RS 5 Speed (totaled)
15.4606@88.42 Mph
96 Toyota Celica GT
88 Toyota Supra NA-T (w/ sports package)
Got Boost?? Hell yeah I-6 turbo powah baby!