I have a 96 civic ex with a bone stock D16y8... I'm a college student on a budget, I love the gas mileage, and I'm not particularly concerned with an engine swap or forced induction. I don't really have any desire to race, but I'd like a little extra kick to be there when I need it. I'm talking 20, 30 hp increase, tops... what's the best way to go about achieving that? And what kind of increase should I expect from a simple CAI, header, and cat back combo? Also, as far as the exhaust, how big of difference would it make between simply buying a high flow cat and a muffler and going with the stock pipes as opposed to purchasing a full cat back system?