 I bought the S4 because it is advertised as a track car by Audi at their Sports Car Experience at Infineon Raceway. After a warm up session, then 15 minutes on the track I had fade and then failure from my brakes. At the dealership the rotors were determined to be bad. I have owned so many cars, 10 Audi's, and NEVER has this happened. According to the dealership Audi USA will not cover the brakes they put in my car. How is it the S4's they have you track at their raceway last but mine cannot? This car is not for tracking since the manufacturer does not back up it's product and treats loyal owners poorly. Truth in engineering= failure to support customers.