you can't. the cheapest methods of real power are Nitrous-$500 Home built turbo kit-$800+ The popular intake, exhaust, header combo will not get you anymore than 10-15hp on a good day. If your on a budget and want to make the car more fun do the suspension. You don't need to go fast to have fun. If you only have $100 or so, give the car a tune up and some TLC. Actually that's where you should start anyway, tune up.