This is a great upgrade designed to hold boost in both stock or modified vehicles to provide a quick response in between shifts or under deceleration. This is both a recirculating or vent to the atmosphere type bypass valve that relieves pressure back into the intake system and has been precision machined out of aircraft grade billet aluminum. It will come with an internal brass piston design that has been pressure tested to withstand up to 100psi which is good enough to sustain the most aggressive of turbo builds.
Note that this bypass valve will come in full recirculation mode, to make it vent to the atmosphere, it will come provided with three screws that cover the ports on each side of this valve. Simply remove those screws to open the ports.