Skylar Robinson, son of famous American racer Chip Robinson, puts on a show in a raucous Porsche 962 making a peculiar series of noises. The 2.8-liter, twin-turbo six in the middle of his IMSA GTP racer squeaks and roars, and when the full 750 horsepower arrives in one big lump, it fires the car down Laguna Seca's straighter sections at a …
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