Trevor,
I have recently researched a feature on Audi's mid-engined rally projects, including the 'Group S prototype' that currently resides in the firm's Ingolstadt museum, for a feature in a forthcoming issue of MotorSport here in the UK. Keep an eye out for it - it features some studio-lit photography of the 'Group S' prototype (there is reason to believe, since it features the full Sport Quattro E2 engine, that it had well over the 300bhp that would have been the norm for Group S, hence my slight scepticisim over its official name). The car, incidentally, was built at the same time as the mid-engined Sport Quattro lookalikes that were tested in Czechoslovakia.
John
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