i use 4-1 then change to 4-2-1.

if u wan torque then better use 4-2-1, but reving 4-1 better, very easy rev, rev till 8k also shiok

i was using the old iswara, best bang for bucks is sanding the carburator.

I think he means porting/polishing the carb

but issit true that 4-1 set up will deliver a better pick up overall?

rev till 8krpm burn alot of fuel kao kao ar? xD

1 more question. does a bullet provide better airflow than a midbox? whats the diff between the two?

midbox is just an empty metal tabung,since it has a higher volume,the exhaust gas gets slowed down..the best setup will be to keep the velocity of the exhaust gas high so it can exit the engine without restrictions and the fastest possible way..i dont understand why people say backpressure is necessary..i think the best setup will be a straight pipe from the extractor till the end but this is bloody hell loud hence the need for muffler and bullets..