Hi

My exhaust makes a nasty rattling noise when idling. Can someone tell me how many parts the exhaust is? and likely replacement costs.

Thanks

This might help:
RealOEM.com BMW R50 Cooper Exhaust system, rear (http://www.realoem.com/bmw/showparts.do?model=RC32&mospid=48010&btnr=18_0477&hg=18&fg=20)