I have a 2012 PX125E with a mildly tuned engine. I had a SIP Road 2 exhaust on it for a while. throwing it down my Favorite hill, I got an indicated 69 MPH.
I wanted to see that magic 70 MPH. I fitted a PM Tuning, PM evolution 24 expansion chamber and had 74 MPH on the clock. It's not often I want to kiss a Welder. X X