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The GSC Power Division +1mm exhaust valve is a chrome-polished replacement valve with a 30mm head, offered for Subaru and Scion FA20 applications. The source lists fitment for BRZ/FRS/FT86 models from 2014 onward; the valve increases head size by +1mm as specified. Use explicit engine and model fitment when selecting valves and follow build guidance for installation.
GSC P-D Subaru/Scion FA20 BRZ/FRS/FT86 2014+ 23-8N Chrome Polish Exhaust Valve 30mm Head +1mm - (1)
