Gliding through Portimao's Samsung corner, former World Rally Champion Walter Roehrl is driving the dark silver Cayman GT4 very, very quickly, but by now I've spent enough time with the car to sense it's got some left in it. As we exit Turn 9, Rohrl glances in the mirror at the three GT4s tailing us. They're keeping up. His face, already stoic, tightens. His eyes narrow, and his body language is suddenly but obviously more serious.
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