does the m5 f10 use a 5 series or 7 series shell

[SplatSpeed]

there was an article that i read that they used a 7 series shell for mor torsional rigidity?

is this true?

[theboss]

I thought with the F10 they had already consolidated the architecture between the F01/02 and F10/11/12/13, it wasn't something specific to the M5