Endurance ace David Jahn is setting a smart pace at Porsche’s private Leipzig racetrack. His 911 Carrera’s spoiler deploys when straightaway speeds near 100 mph, then retracts under braking. Three journalists nip at the 911’s rump around the 2.3-mile collection of corners copied from the world’s most revered circuits, SOP for these occasions. What’s unusual [...]

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