M6GC if you want a 4 door, M6 coupe otherwise.. There really is no comparison, and even if the only modification you do to it is a tune, forget about it! The thing is so fast and easy to drive with the traction systems in place that there's not much out there that can compete with it. An M5/6 with comp package and a BMS JB4 tune on map 2 pushes right around 650whp and 680wtq on pump gas, you're talking supercar power with insane amounts of torque. Made it an easy decision for me.
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