Originally Posted by VTECaddict
I don't know what planet you live on, but all M engines have been modified "vanilla" engines, other than the S85 V10 and S65 V8. So a ground up "M" engine is actually the exception rather than the rule.
Im sorry but I do not agree with you one bit. You may, may be able to strip some of the engines right down to the core and find a minor trace of what once was a mainstream engine, but engines like the s54 and euro s50 b32 are not tweaked versions of regular bmw engines. Nowadays they are though.