HKS 08-14 Subaru Impreza WRX STI/ 2015+ WRX STI SSQV4 Black + Return Kit GRB/VAB

HKS is well-known for making performance parts for Japanese sports cars, and their SSQV4 blow-off valve is a popular choice for Subaru WRX and STI owners. This kit is designed to help manage boost pressure in turbocharged Subarus, specifically the 2008-2014 WRX STI and the 2015 and newer WRX STI models. It helps protect your turbocharger by releasing excess pressure when you lift off the throttle, preventing compressor surge.

This particular SSQV4 valve comes in a sleek black finish and includes a return kit. The return kit is important because it recirculates the vented air back into the intake system, which is often required by factory or modified ECU tuning to prevent issues like rough idling or check engine lights. The SSQV4 uses a unique dual spring system that allows it to hold boost pressure effectively while still opening smoothly at low boost levels, contributing to improved throttle response.

When installing this, remember that it is not CARB approved and cannot be shipped to California. Make sure to check your local emissions regulations before purchasing.