This is the HKS SSQ Blow Off Valve with the EVO VII/VIII/IX install kit.

The HKS Super Sequential Valve is a dual stage pull type relief valve, which prevents compressor surge by releasing (either back into the intake stream or into the atmosphere) the compressed air flow that is normally forced backwards into the turbo as the throttle is closed.

Engine performance is increased from quicker turbo spool up as the compressor speed is not reduced by backwards air flow. The life expectancy of the turbo is also increased, as its bearings will not suffer from the impact that is common with compressor surge. For maximum performance the SSQV incorporates a small primary valve for quick activation that opens under light boost and load conditions and a larger secondary valve that opens sequentially to relieve pressure under higher boost and load conditions. The SSQV is constructed from billet aluminium for durability and has a high quality polished finish.

The SSQV’s are available as vehicle specific kits or as a universal unit for custom applications. Vehicle specific kits come complete with all the necessary mounting flanges, brackets and hardware for easy installation. For the universal applications steel, and aluminium weld on flanges are available.

Gold coloured triple fin inserts that produce the same unique aggressive blow-off sound, as the standard silver inserts are available as an optional replacement, as are metallic purple inserts that produce a lower frequency sound over the standard item. A re-circulating fitting, which re-routes the discharged compressed air back into the intake stream, is also available.