Your RZR TRAIL 1000 S Tractor is electronically limited for homologation purposes to 60 km / h. Using the MCECUZ20ASSS99R ECU will allow you to reach a maximum speed of 130 km / h which will allow you to shine in competition. Compared to the MCECUZ20VBSS99S version, increased engine speed, increased max speed, improved acceleration at all engine revs.