• S3 billet camshaft, 282/282 duration
• Built specifically for EJ20 JDM/Euro Spec STI (not compatible with USA spec engines)
• Billet core for precision and consistency
• Genuine GSC Power Division engineering

S3: Gsc's most aggressive standard grind for serious builds

GSC's S3 billet camshaft is ground to 282/282 duration specifically for the EJ20 JDM/Euro Spec STI platform, positioned within GSC's cam lineup as GSC's most aggressive standard grind for serious builds. Being a billet cam rather than a re-ground factory core, this camshaft starts from a precision blank rather than being limited by the factory core's base circle and material properties. That billet construction is what lets GSC achieve consistent, repeatable lobe profiles across every cam they produce. It's a straightforward improvement that's easy to appreciate once it's installed.

What This Cam Actually Feels Like to Drive

In terms of real-world feel, this cam delivers maximum top-end power for a car that's built to be driven hard, giving you a clear expectation of how the car will behave before you commit to the install. GSC's cam lineup is specifically staged this way so you can choose the level of aggressiveness that matches your actual build and driving style, rather than guessing at a generic "stage" cam from another brand. This variant is JDM/Euro spec specific and will not work correctly on a USA spec engine, so confirm your exact engine specification before ordering. That combination of durability and performance is what makes it worth the upgrade.

Straight From Subispeed

A billet S3 cam for 2002-2014 WRX / 2004-2014 STI — GSC's most aggressive standard grind for serious builds, with genuine GSC engineering behind the lobe profile.

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