step:
1. tune up + carbon clean, .. kurang puas?... next step
2. porting polish... kurang puas?... next step
3. ganti performance exhaust dr header smp muffler, open air intake ... kurang puas? ... next step
4. piggy back ... kurang puas?... next step
5. Turbo ... kurang puas? .. next step
6. Swap engine