I've notice a considerable amount of "thumping" from the rear suspension in Sport and Advanced modes, and to a much lesser degree in Comfort when the car is driven at slow to moderate speeds (under 70 MPH).</P>


I've been told there is a software upgrade, but the service manager says it will change the car's handling. </P>


Has anyone else with a new "R" series noticed this noise and have you had the software upgrade? What are your impressions of the fix?</P>


Thanks</P>

The fix is worth it, go have it done.</P>


no negative effects as far as i can tell.</P>


Good luck</P>