Home > Subaru > STI 2015-2018 > Engine Build > Cylinder Head > Valves > +1 mm Larger
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GSC Chrome Polished +1mm Exhaust Valves 02-14 WRX / 04-17 STI GSC Chrome Polished +1mm Intake Valves 02-14 WRX / 04-17 STI GSC Chrome Polished Super Alloy +1MM Exhaust Valves 02-14 / 04-17 STI
+1mm Over Sized +1mm Over Sized +1mm Larger Size Super Alloy