• Super alloy exhaust valve, 33mm head diameter (+1mm)
• Upgraded alloy for extreme exhaust-side heat resistance
• Chrome polished stem for reduced friction
• Sold individually

Super Alloy Construction for a Punishing Environment

Exhaust valves face some of the most extreme thermal conditions anywhere in the engine, cycling between combustion heat and exhaust gas flow thousands of times per minute. GSC's super alloy exhaust valve, sized here at 33mm head diameter in the +1mm option, uses an upgraded alloy specifically chosen to handle that punishing environment better than a standard valve material. That material upgrade matters most on a genuinely built engine running higher boost or sustained high RPM, where a standard exhaust valve can start to show heat-related wear. It's a straightforward improvement that's easy to appreciate once it's installed.

Chrome Polished for Reduced Friction, Sold Individually

The chrome-polished stem reduces friction as the valve moves through the guide, supporting both longevity and consistent valve action under sustained hard use. This valve is sold individually, so confirm the exact quantity and head size you need for your specific build before ordering. It's the right choice for anyone pushing their EJ20/EJ257 build's exhaust side harder than a standard valve was designed for. That combination of durability and performance is what makes it worth the upgrade.

Straight From Subispeed

A serious, heat-resistant exhaust valve upgrade for 2002-2014 WRX / 2004-2015 STI — sold individually for a build that's genuinely pushing exhaust-side limits.

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