This is the cam we use in all our sport and race R53 engines. It provides increased airflow across the rpm band from 3000-7500. This cam can be used on the street as well as the track with its slightly rougher than stock idle characteristic.
Intake: Duration 264, Lift 9.5mm Exhaust: Duration 272, Lift 9.0mm
Stock R53 cam specs Intake Duration 250. Lift 8.4mm , Exhaust Duration 254, Lift 7.85mm