You might need to dish out some cash, but it can be done, check out RSM Racing they do work on cavaliers
Intake, Free flow cat, free flow muffler, Upgrades to the ignition, adjustable pressure regulator? raise the psi. RSM can do things like bore ur Throttle body, Head work new valves and valve springs, port and polish that should help. They make custom pullies, lighter than any other retailer.