which exhaust for 172 runner??

No wayyy,

Polini Evo FTW.. :bird: imp:

 

i'm gonna go with a scorpion - road legal for a start and looks good - Pm pipes are better, but not really meant for every day road use in my opinion.... it is funny how exhausts for 50cc's are about £100 but then you gotta double that for 125's. makes me think about getting a 50cc just to do up - half the price of my 125

 

It depends how much you want to tune the 50 though, Theres a wider range of parts for 50's, and a lot of them parts are far from cheap.