I would certainly not say that previous M3's sounded bad. The word I would use is tame. The aftermarket supply simply offers different means of "unleashing" a more aggressive sound note from the cars.
With what we've heard of the F8X so far, not only is it tame, as most other M3's (and all M's) are, but it's flat out bad. In addition, the farting sounds are absolutely ridiculous.
Yes aftermarket options will improve the sound, but the baseline they are working with here is not very promising.
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