Wishful thinking...it will go mostly to the bottom line and the M cars will still not be quite as profitable as the non-M cars (vs. minuscule profit per vehicle of prior gens). Not to mention other 'serious engineering' costs such as such as fake engine sounds, fake steering, fake manual transmissions, fake road feel, fake M cars, etc. There is really nothing groundbreaking about the M5 and M6 technology wise that make them game changers, apart from clever ways of using turbos to boost power and attempt to mimic N/A engine characteristics and improve fuel efficiency.
Originally Posted by NISFAN
Do you realise what kind of budget is needed to develop a from scratch engine?
If you did, you would know that using an existing engine would leave plenty in reserve to give shareholders a better margin and spend serious cash on 'engineering'.