Kevin, I will be up in your area next week. Taking it to Nick Williams shop to run it on the dyno. I will try and stop by your work on the way.
I am not sure about other Vintage Air units, but I have Gen II super cooler and it recycles cabin air. They even give you a plastic cover plate to block off the cowl vent on the passenger side.
It's obvious why you are happy with it! They did a great job. Really fits the whole car. Nice to see a plan finally come together the way you wanted, huh? Nice job Payton.