KO Racer-when the carpet gets dirty-you can easily have a car that dirty in one run!! Trust me!!!! Also-just a few laps with the diff cover or even the spy hole off and filthy!!!
And last -check how much goo is pressed into the pulleys and belt-thats more telling.
Hope that helps.
And KRAIG-yup Todd said a month ago or so that some part numbers wont change on the G+-it'll just be a running change.