A rare Gunther Werks Speedster is being auctioned in August at Mecum’s Monterey sale. The 993-based car has widebody carbon panels and a 4.0-liter flat-six making 430 hp.

A rare Gunther Werks Speedster is being auctioned in August at Mecum’s Monterey sale. The 993-based car has widebody carbon panels and a 4.0-liter flat-six making 430 hp.