My M5 has now 46000 kms, and apart from the clutch which's shaking always a little at idle, the driver seat and the front passenger are shaking a little too. You do not notice it when the car is moving but at idle it's a little annoying. It's not a great shake, but you feel it clearly.
My question : could that come from my mid exhaust silencer that i removed and replaced by straight tubes (the car make only a little mor sound at idle than with the original silencer), or has anyone else a M5 here also with shaking seats ?