Ok, so I have a cutout pipe inplace of my cat with a triangular 3-bolt flange blocking off the opening. I know they make electronic valves, but I'd like one that will open automatically under boost. I saw somebody on the board made their own in the fab section, but I don't have the resources to make my own, so does anybody know of vendors that sell them? I would prefer SST since the rest of my exhaust is.