I notice the "clunck" noise from day one taking delivery. It happens occasionally but certainly doesn't bother me as much. If BMW comes up with a solution, I'd be glad to turn the car in for the fix. If not, I can live with that. My local dealer has stated clearly that if there is an aftermarket part on the car, they will need to make a note of it and factory warranty won't cover that particular part(s) from that point. I know some dealers might be more mod-friendly, but mine isn't and for a car like this, I'd stay stock with everything for as long as the warranty last.
Must stop eating..............