GSC P-D Subaru EJ255/EJ257 (USDM) w/Intake AVCS S3 Cams 282/282 Billet

If you're looking to get more out of your 2004-2007 Subaru Impreza's EJ255 or EJ257 engine, especially one equipped with Intake AVCS, these GSC Power Division S3 camshafts are a solid choice. These aren't just stock replacements; they're designed to change how your engine breathes, allowing for a significant improvement in airflow, which translates directly to more power and a more responsive feel when you get on the throttle.

What sets these cams apart is their billet construction, meaning they start as a solid piece of steel that's precisely machined. This method results in a very strong and durable camshaft that can handle the increased stresses of performance driving. The S3 profile features a 282-degree duration on both the intake and exhaust sides, a popular choice for builds aiming for a noticeable power increase across the RPM range, particularly in the mid to upper bands. This duration, combined with the specific lift profile, is tuned to work effectively with engines that have Intake AVCS (Active Valve Control), optimizing valve timing for better performance and efficiency under various driving conditions. They are designed to be a direct fit for USDM (United States Domestic Market) EJ255 and EJ257 engines, simplifying the installation process for those familiar with Subaru engine work.

When installing these camshafts, it's important to ensure your valvetrain is in good condition. You'll want to follow the manufacturer's recommended installation procedures carefully, which typically involve proper camshaft degreeing to achieve the intended performance gains. Because these are performance camshafts, you can expect a change in your engine's idle characteristics, often a bit rougher than stock, but this is a common trade-off for the improved top-end power they offer. Keep in mind that these camshafts are not CARB approved and cannot be shipped to California.