With the ECU flash the vehicle in all stock form (tires, clutching etc....) will run to about 57-58 mph. With oversized tires you will gain speed but it all depends on the size you decide to run. With our machine running 28" tires we are able to reach speeds of 63 mph on the stock clutching. Clutching modifications will be made available as well in the near future to allow added speed as well.