if u wanna learn to mod ur car, must not hesitate to get down n dirty to do it urself mah... thats the most direct way to learn stuff...
there is a cheap alternative, why resort to expensive aftermarket stuff.... both basically works the same....
basic startoff to improve ur car performance, I/H/E (intake, headers, exhaust)...
- installing highflow air filter (open pod or drop in) improves suction of air...
- headers/extractor.... get a tuned header so ur exhaust gas can channel out easily....
- exhaust... includes piping, mid section setup (bullet/highflow cat/ twin bullet) and muffler.... get a reputated workshop for advice on the best exhaust setup for ur car to suit ur driving style....