save up a little bit more and get 4g93 twincam... should be good enough for u...
but if u insist to do something with that sum of money, look for powerzone... they can do something for u...
if u dont wanna look for powerzone, can alwiz refer us for some 'no-so-reliable' advices (coz different car, different setup)...
1) get a tuned length 4-2-1 extractor, midbullet, any muffler, 1.8" original route piping...
2) open-pod performance filter... (dont get those cap ayam one)... recommended are HKS, Blitz, K&N, Apexi
3) get a mild camshaft... powerzone can help u...
4) jz incase u have a 1.5L carburettor engine, change the carb to weber carb... should give u good power increase...
5) .....
6) ...
and so the list goes on...