hii i have kymco dj50s 2014 4-T, it goes 41mph -65kmh i want to make it to go at least 47mph and it goes 15-20 in idk how to say , in higher road and i dont like that i asked some my friends who know more from me about scooters they say exhaust will not give me more speed soo if you can give me some suggestion what to put on my bike for more speed and power ...ty