can any one suggest what can i do for my exhaust(currently driving mivec 1.8)?? sound really loud until i pening after cruising 50++km back home, although i use mid silencer(mid muffler), piping 2.5 " but dunno y no power when mivec on ..... not enough tarik force at all like last time before bot.... is it maybe the exhaust guy do wrong or the mid silencer kacau since i know my air is not smooth, like bike, if press pedal to rev and release, got bob bob sound, air struggle to escape, how about the performance and sound if i change to use 2" direct with s.flow at the end? how can i overcome this?? pls advise