I did some research and found that the Viper in fact was quicker around the track. I know I have read on more than one occasion where the testers were complaining about the Viper being more expensive, heavier, harder to drive and slower than it's cheaper counterpart, but I am unable to find the article. IIRC, it was the C6Z06 VS the 500hp Viper. The testers were saying that the Vette was the quicker of the two, but the 600hp Viper would be able to hold it's own once it arrived. The only facts I have are that the Vette is lighter and cheaper than the Viper. Not sure about the ZR1 price compared to the ACR or the ACR-X. If I'm not mistaking, the ZR1s were going for a little bit more than the supposed $110,000 price tag of the ACR-X.
