HKS Racing Super SSQV4 Blowoff Valve

This is the grandfather of blow-off valves with its flagship sound that remains to be one of the most effective blow-off valves in the aftermarket.
Here are the details:
 
Pull-type sequential valve structure
New differential pressure control system allows for stable operating ranges from low to high-boost pressures
Includes vacuum line filter
Includes circlip, T-fittings, and zip ties