I have full access to this as I work 10 feet away from where they are doing the press event. They are taking the cars to Laguna Seca today (Tuesday) and running them as they are shipped with no brake or tire upgrades!!! I wish I had time to head over to the track and check it out. The F30 335's exhaust definately sounds better than the E9x 335, although I am no expert.
Here are the quick iPhone pictures I took just passing by. Let me now if anyone wants any specific pictures and I should be able to get them tommorrow.