Supersprint makes a quad for the euro 330 which I believe is said to fit the 328. The tips come out in the wider position of a 335 though, rather than the narrow position of the M3. Also, it's ~$2,000. That's probably why it's so hard to find any info about it.
I'd post the link but my understanding is the mods frown upon posting links to non-sponsors. It's one of the first vendors to come up in any Google search for BMW parts.
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