A good mate of mine ordered an M6 the other week and collected it this morning.
He drove it in "normal" mode and the power shocked him, so he came around my place & asked me to give it some in the "M" mode which apparently produces a further 100 BHp taking it from 400 to 500.
V10 engine and all the electronic gismos on the planet.
I gave it a hammering as requested with him hanging on for dear life beside me lol..........he's funny.