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Check the gearbox to front pipe exhaust bracket. These can rust through and rattle.
Number 4 on here:-
http://www.realoem.com/bmw/showparts.do?model=BE72&mospid=47426&btnr=18_0248&hg=18&fg=30

Also check all the exhaust heat shields around the cat....:thumbsup
I also have a 318is, if the noise is around idle speed or just above check this exhaust heat shield, mine is vibrating because it is completely worn. I don't want to buy a cat for that so do you think it's possible to just remove the shield and drive like that?
 
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