If I were to go forward with putting the GTR plenum on the car... I would take the VHR lower runner section and have it 3d scanned into CAD. I would also scan the runner flange on the GTR plenum. Then in CAD, cut about an inch off the top of the stock VHR part, and CAD up an adapter to the GTR pattern. Make it as thick as required to clear the VHR plenum, integrate in the fuel rail mounts as required, then machine the adapter. Put the VHR runner section in the mill and take that inch off the top of it, then weld on the adapter flange and port match. Then you dyno test it...!
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