Osella PA21
The Osella PA21 is a series of Group CN sports prototype race cars, developed and built by Italian manufacturer Osella. The cars mostly compete in hillclimb races, trials, and events. They are commonly powered by, and designed to be equipped with either a naturally-aspirated  Honda K20 engine, producing in excess of , or a motorcycle engine, in the displacement range of , such as a Suzuki Hayabusa, or an S1000RR motor. References 

Sports prototypes
Osella vehicles
Mid-engined cars