The GSC Power Division +1mm exhaust valve set for Subaru FA20F WRX (2015+) is a polished, chrome-finish valve package specified for that engine; each valve has a 30mm head and the listing denotes a set of eight. These replacement valves are intended for valvetrain service or engine rebuild work where +1mm oversize valves are required, offered as a matched set with a polished finish for assembly and inspection.
GSC P-D Subaru FA20F WRX 2015+ 23-8N Chrome Polished Exhaust Valve 30mm Head +1mm - (8)