Is this BMW M3 prototype powered by an inline or V6?
Bimmerfile posits that a V6 could be "loosely based on the M5′s S63 twin-turbo V8, but with even greater high-end power and efficiency." Whatever is under that hood – and whatever is handling that lightning-quick gear change, don't quite sound like anything that's come straight from the factory before, at least to our ears. Follow the jump to watch and listen for yourself and make a guess in Comments.
BMW M3 Information
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