Hey guys i have a 93 10th Anniversary and the thing that i've found makes the most dramatic improvement (for a stock suspension setup) is front and rear strut braces and a rear lower tie bar. With those on the car will feel like a whole new vehicle cornering. APEXi makes an excellent cat-back called the WS. it looks great with stainless steel and is almost as quiet as stock (which will save your hearing in the long run); it also makes for a good sleeper car with the WS, as nobody will hear you at stoplights, unlike most Integras, Civics and ToyoMitsuNissans.
tc all