Hey there, great thread. I'm currently troubleshooting a load of small noises in a recently acquired '97 M3. Here's a tip for y'all, check that the door trims are tight against the panel. New plastic clips can be bought from the BMW stealer of pence... and removed door trim rattles instantly! When doing this, don't be afraid to 'muscle' the panel off in the first place.. it's damn tight"
I have a 'squeak' when pulling away or accelerating from it sounds like the rear seat. or perhaps below it. No knocks or anything when driving (had new bushes to fix that), just a one off 'squeak' when pulling away. even had the wife drive it with the rear seats out so that I could locate it... any ideas or similar experiences?