Costs ballooned because of the all-wheel drive, sequential turbocharging and other technology Porsche had never even thought about when it set out to build a 911 to compete in Group B. Schutz ...
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Porsche Once Built A 911 Prototype With Four TurbochargersIt had sequential turbocharging, so extra power was always there. The Volkswagen Group has been selling cars with quad turbocharging since the Bugatti Veyron was launched in the mid-2000s.
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