Go try and error ba.

This thing all see police one if u dont mind negotiate with them can try put this exhaust one. Sometime they wont kacau but sometime they kacau if they kacau also they one purpose only, want money nia.. Than u watch them act act abit u give them some kopi money kau tim lor.

if u mod pipe become loud.. too loud police sure catch u..

mod pipe give smoother air flow.. stock pipe got many restriction.. meaning sir flow not smooth... when u rev time.. like the bike very hard wan to go.. that means restricted.. 

Smash revo ah? Yoshimura lo..XD