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Nissan straight bailed on lack of results (including finishing behind the new Audis), and Mercedes downsized to DTM because there waa no championship and their Le Mans appearances were embarassments. They were replaced by Chrysler and Cadillac, which both got competitive chassis but decided they couldn't afford new engines capable of competing with Audi's purpose built direct injection race engine on both power and efficiency. Remember up until then even Toyota was using an old Group C engine.
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