GSC Billet S1 Camshafts - Single AVCS (04-07 STI, 06-14 WRX)
GSC 7000 Series Full Billet Camshafts are 100% in-house cut and ground on the newest, most precise CNC machines available. The 7000 Series camshafts take the import valve train market to another level, being the only readily available and affordable billet camshafts for sport compact/import performance cars.
GSC Power-Division Billet S1 camshafts for the USDM STi and WRX with Intake only AVCS. These will not drop any low end power, and will creating more power and torque across the entire RPM range. Good for stock frame upgraded turbos or up to 500WHP upgrades. Upgraded valve springs are required; Beehive valve springs are recommended but not required.