I don't think that Audi will withdraw at Le Mans when Porsche returns. Endurance Racing with Sports Prototypes is vital to Audi's marketing strategy, while F1 isn't. F1 will also see V6-engines in 2014, and I doubt that Audi is willing to compete with a 1,5l-V6 turbo, as it simply doesn't fit to Audi (Who associates such an engine with an Audi?).
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