GSC P-D 08+ STi S3 Cams 282/282 Billet

GSC Power Division is known for making serious performance engine components, and their S3 camshafts for the 2008+ Subaru STi are a prime example. These aren't your average drop-in cams; they're built for drivers who want to extract the most power from their EJ25 engine, especially when you're pushing the limits with a modified setup. The 282-degree intake and exhaust duration means these cams will open the valves for a longer period, allowing more air and fuel into the cylinders and more exhaust out, which is key for making big power at higher RPMs.

These S3 cams are made from a solid billet core, which is a much stronger foundation than a reground stock cam. This billet construction ensures they can handle the increased stress and higher valve spring pressures often found in modified engines. The 282/282 profile is a popular choice for builds aiming for a broad powerband, offering a significant improvement over stock cams without being so aggressive that they become difficult to manage or require extreme valvetrain modifications. You'll notice a substantial difference in how the engine breathes, especially as the RPMs climb.

Keep in mind that camshafts of this performance level often require supporting modifications to truly shine. This includes upgraded valve springs, retainers, and potentially a revised ECU tune to take full advantage of the increased airflow. Also, please note that these camshafts are not CARB approved and cannot be shipped to California due to emissions regulations. Always refer to the manufacturer's installation instructions for proper fitment and setup.