GSC Power Division Billet S1 Camshaft Subaru 2008+ STI EJ257B With Dual AVCS. Good for stock frame turbo or up to 500 WHP (GT35R) upgrades. Upgraded valve springs arerequired; GSC Power Division Billet S1 Camshaft Subaru Beehive valve springs are recommended but not required.
Check Pictures for cam placement. Long nose = Left Side. Short nose = Right Side
Due to the lobe size, head castings will need to be filed down slightly for clearance - Please check during install