If you are referring to the old M6, then I would much rather have a blown M3.
I would however take the F12 M6 over a blown M3 anyday (and just wait until the performance market opens up for that car, they are already seeing 80+rwhp with a tune) Downpipes, tune, intercooler, etc... I anticipate the M6 would be up to a blown M3 performance
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