I know about the 6R4, don't remember the Audi. I've never been that much involved in rallycross, even if the track is only 15 miles away.
The first owner of Car Glass was a personal friend and fellow businessman of Kumpen, hence the permanent sponsorship over the years in RC and circuit racing.
I guess they still have some sponsorship on their cars now, whatever they run at the moment.
The picture of the white Holden in your post 4 was the one I mentioned being run by a private team, but it had many different guises.
I think Kumpen bought that one as well afterwards and ran it himself.
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