I too took my '08 isf to the track and was very disappointed. My best time was a 13.6 @105. The track temp. was 92 degrees and 100% humidity @ approximately 1200 ft. above sea level. I was really hoping for a low 13 but the heat was just too great. Oh well, I guess it's not all that bad. I did see a procharged c6 z06 running 12.50's @12x so I'll wait until the temperature drops significantly before I return. btw...good looking run against the z06.