I have a aerox and im thinking about buying a yasuni c16 but if i buy the exhaust do i have to put anything else on my bike to be able to fit the exhaust or do i just put the exhaust on and then it will be fine??
Idd, your better of with a Yasuni R or a Gianelli shot.
Those are, imo, the best two performing exhaust on a stock engine.
Also their cheaper than a C16, plus they also wil perform very good on a low / mid RPM 70cc cylinder.