GSC Power Division Billet S1 Camshaft Set Subaru WRX STI MY08+ Dual AVCS

GSC Power Division Billet S1 Camshaft Set - Subaru WRX STI MY08+ - Dual AVCS

GSC Power Division builds its camshafts from billet stock rather than reground cores, giving tighter lobe tolerances and more consistent valve events under sustained boost. The S1 profile is engineered for the Subaru WRX STI EJ257 with Dual AVCS, offering a solid step up in airflow while keeping factory driveability largely intact.

This listing covers the Subaru WRX STI GRF and GVF chassis from MY08 onward, fitted with the Dual AVCS EJ257 engine. SKU GSC7026S1 is suited to stock frame turbo setups right through to GT35R sized upgrades producing up to 500 WHP.

Note: Long nose camshafts fit the left side and short nose fit the right side — refer to the images for correct placement. Some head castings will need light clearancing for the S1 lobe profile, so check fitment during install.

Key Features

• Billet construction for improved strength and consistency over reground cores
• S1 lobe profile designed for stock frame turbo through to GT35R level builds
• Rated to approximately 500 WHP
• Dual AVCS compatible EJ257 fitment
• Left/right specific camshafts — long nose left, short nose right

Vehicle compatibility, OEM part numbers, and fitment notes are provided in the tabs above. Please confirm your STI's model year and engine configuration before ordering.

Not sure if this camshaft set suits your build? Contact our team at sales@chicaneaustralia.com.au for expert advice.