While the specs of the upcoming GTR have not been made official, from what we know f it, the Z06 has some advantages. Not to put the GTR off, but the GTR will be a relatively heavy car and will probably have less power than the Z06. That's not to say the GTR won't be competetive or perhaps even be able to best the Z06 on the 'Ring'. Consider the GT-R at one time set a record at the 'Ring'. It's a benchmark that is bested over and over again. I speculate Nissan is aiming at that spot even if for only a short time. Nissan's ATTESA AWD system will probably have plenty to do with it. I'd imagine a Z06 would have to be a bit finicky in exiting turns. The AWD in the GTR will probably be rear biased like always and allow quite a bit of torque transfer to seek out any available traction on exit. Unless accelleration is severely biased to one car, in a course with a lot of high speed straights, exit speeds are going to be key. If the GTR is going to be able to break any records, this is going to be key. And before anyone starts saying AWD is heavier, blah blah, consider that in a recent article that tested current AWD sport sedans, they put a RWD #5 against an AWD one. While the G35X AWD system is not tuned with a big emphasis on performance, and is a couple of hundred pounds heavier, it beat the RWD version around a course in the dry and wet. I'm not saying the GTR will win as my initial impressions based on speculation around the GTR's specs would lead me to believe the GTR would have an uphill battle, but I certainly won't pass it off at this point. Especially with rumors that Lotus is tuning the suspension and Cosworth is tuning the motor. Either way, this just goes to show when businesses compete, consumers win.