I realize there is more to PP2, but I don't consider it "collector grade" like a GT350R, where there are bespoke parts. Special? Yes, but not the type to put in a garage and oogle.
Enjoy the car... PP2 in my opinion is special, but not collector grade. It is a GT with additional suspension bits. That's it. The engine is stock GT, not even Bullitt-level with an upgraded intake. Interior is same as GT. I don't think there is any significant premium to be had for these.