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One more update about the brake temp limp mode. I checked with Turner and Bimmerworld techs. They both get lots of queries about the brake temp limp mode on N54/N55 cars. There's no street legal solution. As Kori said, the factory engine management system must be removed and replaced with a stand-alone racing engine management system. The hardware cost is enormous and engineers who know how to tune them charge about $2000-4000 for one or two days testing/tuning.
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