To my infos the M-GmbH change their engine choise from an I6 N54/55 derivative to an V6 based on the M5 S63 V8 simply because an engine based on the N54/55 with the needed 450+ HP doesn´t fullfill the reliability requirements that BMW has to an engine that they are bringing on the Markt.
BMW/M-GmbH is an Manufacturer and no aftermarket tuner!
Greets Uli_HH
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