GSC P-D 2008+ Subaru STi (EJ257 w/Dual AVCS) S2 Cams 272/272 Billet

If you're looking to get more out of your 2008-2016 Subaru Impreza or STI's EJ257 engine, especially one equipped with Dual AVCS, upgrading the camshafts is a significant step. These S2 camshafts from GSC Power Division are designed to increase airflow into and out of your engine, which can lead to improved power and torque, particularly in the mid to upper RPM range. This is a popular choice for those building a more performance-oriented engine.

What sets these cams apart is their billet construction. Instead of starting with a stock cam and grinding it, GSC starts with a solid billet of steel and machines the lobes from there. This process results in a stronger, more durable camshaft that's less prone to flexing or wear over time, especially under the increased stress of a modified engine. The S2 grind features 272 degrees of duration on both the intake and exhaust sides, which is a noticeable bump over stock, allowing the valves to stay open longer for better cylinder filling. This grind is well-suited for engines that see a lot of track or spirited driving use.

When installing these camshafts, it's important to note that they are designed for engines with Dual AVCS (Active Valve System). You'll also want to ensure your valvetrain components, like valve springs and retainers, are up to the task of handling the increased lift and duration. Because these are performance camshafts, it's highly recommended to have your engine's tuning adjusted by a professional to take full advantage of the new cam profile and ensure optimal performance and reliability. Please be aware that these camshafts are not CARB approved and cannot be shipped to California.