Well, if a friend is going to do 0-120 launches in your car than you should have an idea of it before hand. The mid-engine thing is a concern as is the low production numbers as long as the individual is responsible that it shouldn't be TOO much of a concern. I have come across a number of "car" guys who are very picky with their cars. One such person before I got my 335i was a friend's dad who had 07' 330i and he was extremely weird about it. It wasn't even that big of deal since it was a BMW 330i I thought.