find a wrecked M3 and steal the engine. you will need a new clutch.
OR, a complete tuneup and an EAT chip will give noticable power increase.
new distributor cap, rotor, ignition coil, ignition solutions coil booster, plugs, pulse generator, wires, air filter, fuel filter, carbon canister, 5W30 synthetic oil, timing belt, valve adjustment, new vacuum lines, etc.
or you can spend some more money, get an upgraded engine built from your old core with a stage 2 head, lightweight pistons/rods, bigger oil pump, and slap a turbo and megasquirt ECU on it... that will make your car MUCH faster for about $8000 USD.
Alusil, Dinan DME | ITG Air Filter | Eibach/Bilstein HD | 26/20 Swaybars | Iridium plugs | Depo/ProLumen HID | Optima batt. | no AC | Stoptech brake lines, Frozen rotors, brass bushings, Superblue