Hi there,
Just found the site and registered. Much useful info !!
I am seriously looking at getting an early-ish c63 (perhaps 08) and am planning to travel next week to test drive a car (nearest dealer 2 hrs away) and was hoping to test the pulse of owners on a couple of (practical)...
http://www.rattlebuster.com/how.html
I'm considering using this, not sure how it'll work for softtop though, as the vibrations will just be induced right?