I haven't received my car yet but when test driving both 6MT and the DCT I heard some clunking.
(Flame Suit On) - I think this is normal when you introduce stronger parts to cope with the power. This is the compromise between comfort and performance. There is no better example than my previous Mustang (07 GT Blown) where the rear end would make a ridiculous clunk sometimes when shifting from 1st to 2nd when cold (and when shiftign into neutral from 1st). This is normal for a car meant to handle burnouts, repeated clutch dumps etc. I think the M3's engineering is far superior so the clunks are less noticable but still present given that this car is meant to hit the track and perform reliably. I call it character
(Flame suit off)