I've had my 01 Z3 coupe for about three months, and lately the noise has started to get on my nerves. Are Z3's considered noisy? It sounds like tire noise, almost like a truck with mud tires, and it all comes from the rear? I need to get a decible meter to measure it. I'm starting to be concerned that there is something wrong with my car. I've eliminated the engine/exhaust, because when you pop the clutch it doesn't go away. I also don't think its tire noise, my tires are in good shape, and the noise seems to get louder at around 25mph.