The Blow Off Valve helps protect your turbo from compressor surges. If you should suddenly release the throttle (while on boost), the BOV opens and dumps (by the dump tube) the inlet pressure.These surges occur when throttle is released while under turbo boost. With no place to go, the compressed air pushes back against the turbo, possibly damaging it. The Blow Off Valve will react quickly to this situation and release the compressed air, giving you a reassuring, distinctive sound to let you know it's working properly.Subaru Impreza WRX Year: 2002+Type: RSReroutes to intake GReddy Blow Off Valves are easily adjustable to prevent both premature boost leakage and compressor surge. Each is made of durable cast and billet aluminum frame .
Full CNC machined aluminum body
Brass piston
High-quality seals
Thermal treated spring
Easy clamp on installation

Blow Off Valve Type H: (BOV-H) Want a valve that people notice when it goes off but don't want "RFL-loud"? The BOV Type H is the valve for you. Providing greater venting flow than our BOV-S, the BOV-H is designed for turbo charged engines running up to 35 psi. Crafted from hard anodised aluminum and brass, the valve is practically indestructable.Specialising in the components and smaller products (up to 2.4 metres) end of the market, Anodizers has established itself as a leader in quality anodizing with a reputation for competitive pricing and delivery. A member of the Australian Institute Of Metal Finishers
Every product is put through vigorous tests to ensure its compatibility as well as its durability. Our products have been tested from the mild to wild and have set many of the records you see in the sport compact industry. Keeping the sport compact market on its toes, we have always produced cutting edge designs, often imitated yet never duplicated.
From concept to design every part is produced in house from the essential cad drawing to the ever so complex machine work.

Twin-chamber blow-off valve utilizes a revolutionary new dual chamber engineered for high and low boost response. On turbocharged vehicles, blow-off valves release
excessive boost pressure trapped inside the intake pipe when the throttle is released.This prevents the pressure from backing up into the turbine compressor housing,
causing it to rapidly stop and causing potentially destructive damage to the turbo.
Twin-chamber blow-off valve uses two separate chambers with an assisting pressure hose. This design allows for a short and highly sensitive spring in the first chamber
that controls a piston and a valve in the secondary chamber.
Features:
1) 3-point sound adjustment
2) Spring tension adjusting screw
3) Piston sits inside top chamber for reduced wear
4) Valve sits bottom chamber releasing excess pressure
5) Encased in high finish aluminum housing
6) Universal, and suitable for all types of turbochargers