Lots of options for exhaust modifications. Just need to find a shop you can trust and won't rip you off. Knowledge wise you need to know that bullets and stuff are pretty much useless in most cases and back pressure is rubbish.After getting out from Johor highway.
3 lane highway I go around 120km/h all the way.
Juz the exhaust is a bit noisy only. Really wanna switch to more quite one.