HKS Super SQV4 Recirculation Kit for HKS 71004-AF013 - 2008-2014 WRX, 2015 STiSKU:
With Super SQV Kit, blow-off air will return to suction like stock air bypass valve to be street legal. Although blow off sound will be reduced, more sound will come out from air cleaner.
For use with HKS P/N 71008-AF013
2008-2014 Subaru Impreza WRX
2015 Subaru Impreza WRX STi