I picked up a new vert 335is with 7000 miles on it. Little did I know when I hit like 7500 i got a really bad driver side a-piller clunk, I mean bad to the point where even loud music wouldn't help. Took it to BMW and took them two tries to fix it. That problem has disappeared completely (have a repair report for who ever has this same problem)
At 11,000 miles I started hearing that squeaky rattle in the passenger side c pillar. It's getting really bad because when I accelerate from 1000-3500 rpm it's a whiney squeak. I booked an appointment with BMW for Thursday to get this resolved and I'll for sure keep you guys posted!