Greddy's New Blow off valve. If you love the performance of a Greddy BOV, think the Greddy Type S was too quiet, like the sound of the Turbo XS and HKS $uper$equential, then you will love this one. The collar propels more sound. It can be recirculated as Nissans need (which is a huge myth) or vented to the atmosphere. It uses the same flanges as the other Greddy's. Retail is $237.00, Our Price - $call Pictured here is an employee showing the capability of his mouth the the potential of the unit.