hi first of get it derestricted then buy a racing exhaust but buy it from the internet on ebay its cooled a yasuni r it should be about 130 quid then buy a polini racing virator bigger jets and it should do 70 mph but if u want it 2 go faster if uve got the money put in a complete gilardoni racing cylinder n a 24 carb polini racing clutch n a lil tweekin 2 the motor n it should do 90+