Class of permits. I had a yamaha 125cc bws for around 4 years. Put just over 13 000km onto it running around the city as a commuter. I so totally loved it. I couldn't justify at the time keeping a "small" 125cc scoot and the 500cc one. So the little one was sold on kijiji. Now the class up...
I had a 125 bws for a number of years. Out of 13 000km around 100 of them had the factory exhaust. I went with a full carbon two brothers with there controller. Yup made a difference in weight and end power. Got well past 70mph a few times on flat ground. Really was a hoot in general traffic.