are you looking to upgrade? (sorry im a little dense today) pretty much all subie stuff will bolt right on. you'll need to change at least the caliper and rotor, and in some instances the caliper mount. the fun part is getting your rims over the new stuff, especially if you are running 14" rims.

 

Look at DBA rotors. Combined with Axxis pads and you wont regret it. DBA are Drilled and slotted with a nice gold center hub and pretty cheap Axxis are also friendlier on rotors than EBC and when properly set(holding brakes while on gas @ around 70mph for a couple hundred ft) wont result in any warping. Thats a good upgrade w/o changing calipers and so on. Otherwise try looking at APracing complete kits. Big bucks but they got loads of items and even make kits for historic Rally cars

 

Most of the time, you can treat your car like a 98 RS. Major differences are that the only headers available are Borlas, and you need bigger wheels do do most brake upgrades, but that's about it. The chassis is almost identical.