Not an M8 test but kind of a cool thing done by carwow... of course dynos all read different but at least in this test its the same one for all the cars ...
BMW, as expected is underrated... but the dyno appears to be optimistic for sure especially in the tq dept. Not sure what conversion they used since it was a wheel hp dyno (I think)... M5 fanboys getting moist LOLOL (Mat kills it)