I read this on corvetteforum.com. Thought some of you might find it interesting.

"Just came back from the track with the 997tt. I did 10 1/4 mile runs and the best time was 11.87@119.65. Note: The 60' foot time was 1.85. My best C6 Z06 60' foot time is 2.01 and a 11.7@124. The 997tt gets the jump out of the hole but gets pulled in at 3/4 track and gets run away from from there. The 997 tt has the Sports Chrono package and has 502 lbs of torque from 2500 through 4500 and believe me after 4500 it goes away. OUCH. Side by side from 70mph until 160 mph the Z06 walked away by 2-3 car lengths. The 997tt Sports Chrono Package is a waste if money because it gives you no help in the upper rev range which is where you are all of the time at the track and on 70mph through 160mph pulls.

Two days later I went to a 3 mile roud course and the Z06 was at least2.5 seconds per lap faster!!!WOW. The 997tt stills feels soft at the track. The 997tt brakes felt slightly better. The steering is about the same both are a little to soft at the limit. The 997 tt in my opinion is a dissappointment!! Variable Turbine Geometry what a joke. I sold it back to a local dealer in Northern California and bought a used 2005 996 GT3 which I have already owned and have come to love. It is a better compliment to my Z06. And is the perfect little brother to my Z06.

Rock on Chevy

I hope this was helpfull to you all.

On another note in the same 70mph through 160mph pull was my buddies F430 and it was at least 4 car lengths behind. Every time I look for flaws in the Z06 all I can really find is a red hot transmission tunnel but after all we are talking about a 70k SUPERCAR bargain of the century. We should all take a bow to Dave Hill and his vision and tenure at GM that brought the Z06 back to life in 2001."