GSC Power-Division Exhaust Valve Guides Subaru WRX/STI EJ20/25

GSC Power-Division Exhaust Valve Guides - Subaru WRX/STI - EJ20/25 Series

GSC Power-Division builds valvetrain components engineered for the demands of high boost, high RPM EJ platforms. These exhaust valve guides are a stopper style design intended to keep valve stem control tight under sustained heat and load, giving your Subaru WRX or Subaru STI a durable foundation for a built head.

This listing covers the EJ20 and EJ25 series engines, including EJ205, EJ207, EJ255, EJ257 and EJ257B variants across WRX and STI applications. Guides are available as a standard sized set of eight, a standard single, or oversized singles at +0.001 in and +0.003 in — select the option you need from the variant selector on this listing page.

Note: Oversized guides require corresponding machine work to the head. Confirm your required size before ordering, as guides are not returnable once fitted or machined.

Specifications

• Application: Subaru EJ20/25 series (EJ205, EJ207, EJ255, EJ257, EJ257B)
• Style: Stopper design exhaust valve guide
• Standard size: sold as a set of 8 or individually
• Oversized options: +0.001 in and +0.003 in, sold individually
• SKU: GSC3025-8 (Std Set of 8)

Vehicle compatibility, OEM part numbers, and fitment notes are provided in the tabs above. Please ensure your engine code and required guide size are confirmed before ordering.

Not sure if these guides suit your build? Contact our team at sales@chicaneaustralia.com.au for expert advice.