GSC Power Division - S2 Cams 272 Billet (Right Exhaust Cam Only) - Subaru 06-07 WRX / 04-07 STIThese have been designed to work with the USDM engines with intake only AVCS. Additionally, these cams are ideal to suit those with high horsepower builds with a power range of 500 WHP and above. A built head with upgraded valve springs is required. Beehive valve springs are recommended, but not required. DETAILS: 272 Intake duration 272 Exhaust duration 10. 80mm Peak lift intake 10. 50mm Peak lift exhaust Duration @ . 040" Valve Lift intake: 233