If you have not already picked up the latest Car and Driver you should pick one up and read all about the Shelby GT500 vs. Vette cover article. In the July 2006 issue Car and Driver does a comparison test review on a 2006 Chevrolet Corvette vs. the 2007 Shelby GT500 Mustang. The article is well written and backed with solid test results but it just seemed bias toward the Corvette in so many ways.
In the article they do comparisons on performance, wieght distribution, skidpad and braking. In most cases the Shelby was behind the Corvette for obvious reasons one being the wieght of the car at 3,896 lbs which is 616 pounds heavier then the vette. One performance test done by Car and Driver that will probably be tested over and over on the streets illegally of course is the accelleration from 50 to 70 mph with the GT500 .3 tenths faster then the Vette.
Although the GT500 came up short in several tests one cannot complain about getting a 500 horsepower automobile for less then $50K. It sure beats paying $60K, $70K or $80K for the likes of a Vette, Viper or M3.
Check out CarandDriver.com for more or pick up the July 2006 issue.