mine does 60mph with a gianelli pipe on, and a 13t front sproket. with a fully derestricted standard pipe i.e. resinator and washer with a 13t sprocket my mate is getting 55. if you can afford it get a gianelli or malossi mhr pipe, although top end isn´t too different, i get there very quickly compared to him. time for an 80 kit soon woo