GSC P-D 08+ STi S1 Cams 266/264 Billet - Left Bank Intake

This listing is for the GSC Power Division S1 camshaft for the left bank intake side of your 2008 and newer Subaru Impreza WRX STi. These are billet cams, meaning they are machined from a solid piece of steel for improved strength and durability compared to cast cams. The S1 grind features a 266-degree intake duration and 264-degree exhaust duration, designed to increase airflow into the engine for better performance.

When you're looking to get more out of your STi's engine, a camshaft upgrade like this S1 grind can make a notable difference. The billet construction means these cams can handle higher lift and more aggressive valve timing. This specific cam is for the left bank intake, so you'll need to order the corresponding right bank intake and exhaust cams separately to complete your setup. It’s a solid option for enthusiasts looking for an improved powerband without going to an extreme race grind.

Please note that these camshafts are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and timing procedures.