GSC Power-Division S3 camshafts for the USDM 04-07 STi with AVCS. These cams are built to suite the highest horsepower drag Subys. With a power range of 750-1000WHP and a rev range of 4500-9500rpms, you need some certain mods to utilize the true potential of the S3s. Built motor, with a built/ported head (clearanced for lift), and a standalone engine management system. Dual valve springs are recommended.
**Due to the lobe size, head castings may need to be filled down slightly for clearance.
