
after install polini max power increase from 8,9hp to 9,5hp.. i can feel the difference but its not good enough for me..
my friend know local exhaust maker who make exhaust for racing, so i contact him to make me exhaust for my vespa..
after 4 trial and error, finally he found correct design for max the standard engine..


i am very happy with the result.. max power increase from 9,5hp to 11,4hp

now i must tune the cvt because my mechanic said that curly powerband at the middle caused by bad cvt tuning... (i still use stock cvt, only lighter roller)