Abstract: In combination with a motorcycle having a frame, a rear suspension swing arm pivotally mounted about a pivot axis to a lower rear portion of said frame, a rear wheel suspended from said swing arm via a rear axle, an upper rear extension of the frame extending above said rear wheel, and an internal combustion engine mounted to the frame between the front and rear wheels, the internal combustion engine having at least one induction port and at least one exhaust port, a turbosupercharger system including a turbosupercharger mounted to and beneath the upper rear extension, the turbosupercharger having a turbine stage with intake and exhaust ports and a compressor stage with an ambient air inlet and a compressed air outlet; a discharge pipe which couples the turbine intake to the exhaust port(s); and an induction pipe which couples the compressed air outlet to the induction port(s).