I bought this for my twin turbo LS2 build but for reasons of "stealth" I'm changing to a recirculating style blowoff valve.
Tial "Q" blowoff valve, black anodized, optional stainless flange, -8 psi spring (easily changed for your application.)
Brand new, only removed from the box for pictures.
I'm located near Sacramento, CA.
Asking $210 shipped.