Hi friends i run a 2005 kimco agility 4t, unrestricted drive boss, unrestricted variator. Think 8 grams variator weights its great on flat roads 70 kmh. Uphill slow. .. Exhaust was leaking. And bike was a bit faster. Mended it and back to 70 kmh. Can any of you please recommend a good exhaust pipe. Unrestricted and not loud. And mine is a 50 cc. Have used GPS many times to check. All help on exhaust welcome. Have ordered a j&j flow carb . Also thank you phill