GSC Power Division Billet S3 Camshaft Kit - Subaru WRX STI (EJ257 Dual AVCS) - 280/280

GSC Power Division Billet S3 Camshaft Kit - Subaru WRX STI (EJ257 Dual AVCS) - 280/280 GSC Power Division builds some of the most respected performance camshafts in the forced induction tuning world, and the S3 billet kit is their top-tier offering for serious street and track builds. Machined from billet steel rather than cast cores, these cams deliver consistent profiles and superior durability under sustained high-boost operation — making them a go-to choice for built Subaru WRX STI engines pushing well beyond stock power levels. This listing covers the GSC S3 billet camshaft kit for 2008+ Subaru WRX STI applications on the GRB, GVF, and VA chassis platforms, featuring a 280/280 duration profile. Important: S3 camshafts are designed for modified engines with supporting valvetrain upgrades. Verify compatibility with your valve springs, retainers, and ECU tune before fitting. Key Features Billet steel construction for superior strength and profile accuracy over cast camshafts S3 grind — 280/280 duration, suited to high-boost built engines Direct replacement fitment for GRB, GVF, and VA STI platforms Designed for use with upgraded valve springs and supporting modifications Complete intake and exhaust camshaft kit Vehicle compatibility, OEM part numbers, and fitment notes are provided in the tabs above. Please ensure your vehicle's year, trim level, and configuration are confirmed before ordering. Not sure if this kit suits your build? Contact our team at sales@chicaneaustralia.com.au for expert advice.