hi there mate, the best way on the 2003 dt´s is to either get a new servo and controller for the powervalve (The uk bikes came with out this vital part.) On the non uk models the bikes are resticted by the ecu and through the speedo. (speedo cuts powervalve off at 60kph..or something. on the oter hand if you don´t want to spend £250 on the servo etc. just remove the exhaust and put a finger onto the powervalve then push down. thios should sho a great ) in power especially is you have an exhaust.