Does anyone know what they are changing on the 09 335i xdrive as far as suspension, wheel bias, ride height, stock runflats, etc? How much higher does the xdrive car sit than the 335i if they both have sports package equipped? The impression I get is that they have attempted to make improvements to the xdrive cars to make them less clunky, but I can't find anyone who knows much as far as specifics.