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This may not be valid on N63 cars but I suspect it is the same. On S63Tu cars the turbo wastegate flaps are completely open to get as much heat as possibly into the Catalytic Converters. Once they are up to temp the wastegate flaps shut which coincides with the rpm reduction back to normal idle level.
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SCOTT26 "So as an admirer of the M5 and a potential customer of an M5 Touring. I would run naked around the streets of Garching if they were to offer one."
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