My friend tells me that BMW claims the M Coupe is the stiffest car they've ever produced. Is this true? He says that it produces 16,400 Newton-meters per degree of twist. I'm not exactly sure what this means, and I know that he isn't so sure either. Can someone please explain this and verify that it really is the stiffest BMW model? I know that the Z4 roadster is about 270% stiffer than the Z3 roadster but I didn't know there were such specific measurements. Also, I don't even know when BMW made a claim like this. It's likely to be true if they stated that 3 years ago but I don't know if it stands true today.
