SteamSpeed STX 71R for FA20 (2015+ WRX) July 29, 2017 1152 × 2048 SteamSpeed STX 71R for FA20 (2015+ WRX) A 6/6 style GTX2971R spec compressor wheel. A 6/6 style GTX2971R spec compressor wheel. This is also the style of compressor housing we use when we make turbos for other people.