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The cab is only marginally slower then coupe or rest of the line up, it's only the handling which is significantly different between the coupe and cab.
You will be way faster then the m4 in either format albeit 3rd gear 90mph+ as up to that point nothing seperates them, I know because I own a comp m6 and my partner aka my other car is a m4 comp and up to 90 mph the m4 is dead next to me an occasionally a metre ahead as they get off the line better somehow too but after 90 mph the m6 pulls away pretty hard.
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