Brian Crower BC0621 Camshaft (Subaru EJ257-04-07 STi 06-07 WRX-Stage 2-Set of 4), 4 Pack Brian Crower high performance camshafts are ground on state-of-the-art CNC cam grinders to insure accuracy and tolerances to within By grinding cores in high volume, Brian Crower is able to pass the cost savings on to the end user Every Brian Crower Camshaft profile has been prototyped and dyno tested for proven horsepower results prior to placed into mass production