I was just wondering if any other R8 owners have had any problems with their front diff? I started to hear a slight grinding/scraping noise that was dependent on vehicle speed about a week ago and when I brought the car to the dealer today, they said the noise was coming from the front diff and that they were going to replace the entire unit. Seems really odd to me to have a diff problem on a one year old car w/ 14k miles on it. Anyone else experience any issues?