just took this cutout out of my car and works fine. the valve begins to open aroun 4-5 psi and is fully open by 9-10 psi. the valve is 3 in in diameter and is mounted to a 2.5 inch y pipe with a reduction.
price is $130
I'm parting out an 86 regal limited. I already started taking the interior out so if you need anything and don't see it in the pictures just ask and shoot me an offer. The only thing that is missing is from the header panel forward.
