[RobUK]

I'd agree regards the tyre noise on the 328i and assume it's much the same on the 330d. To put the wind noise into perspective, I drove along the new section of the A1 earlier this year and it uses a very smooth road surface that reduces the tyre roar you get with most UK roads by a good 75%. That allowed me to really get a feel for the wind noise which actually wasn't that much, in fact the car felt very 'serene' - much more like these larger, better insulated exec cars do on regular roads.

I don't think there's anything practical you can do by way of additional insulation given the various routes the tyre noise takes to get to your ears (and you shouldn't have to on a new car!), so if noise is a deal-breaker then the F30/31 probably isn't the best, although haven't driven the current C Class to be able to compare.