Supercharger for Drifting ; Rotor-To-Rotor Clearances / Rotor-To-Housing Clearances / Timing Between the Rotors ; Over the years with the help of Whipple we have done a lot of R&D and actually changed a lot of the clearances ; not only rotor-to-rotor but rotor-to-housing clearance , as as well as the timing between the rotors so that these superchargers , as big as they are , can actually then live an entire season now ; the only maintenance needed to be done is maybe changing the gear oil inside the head unit