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Message: <blockquote data-quote="wllchan" data-source="post: 698252" data-attributes="member: 13689">I had same problem with my 325 Msports(2008, pre-LCI), but at 80km/h and above.The humming came from centre to the back, with small vibration on floor pan.After many round checkings(rear tyre balancing, rear wheels bearing, long shaft coupling) - finally found out it was due to auto torque converter off balanced.Got the torque converyer repaired/overhauled, changed long shaft coupling, needle roller bearing, long shaft centre bearing. The car is working well now.Hope this help<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>