A month after the unveiling of the 550-plus-hp 2012 Chevrolet Camaro ZL1, rumors have been leaking out that Ford will advance the pony wars with a 2013 Shelby GT500 over 600 horsepower.

Some of these rumors are saying the horsepower could be as high as 620 horses! This the result of boring out the current 5.4-liter V-8 to 5.8 liters and swapping the current Eaton M112 supercharger for the more-efficient and quieter TVS unit. This supercharger has a four-lobe rotors design and is the of choice of Audi's S4, Cadillac's CTS-V, Chevrolet's Corvette ZR1 and the all new Camaro ZL1..

The current 5.4-liter in the recent GT500 already makes 550 hp. The car goes from 0 to 60 mph in 4.1 seconds and blasts through the quarter-mile in 12.4. With this new horsepower increase we should see the new 2013 GT500 to be at least a full second quicker on the quarter mile. The current GT500 tops out at 155 mph , whereas the new 2013 GT500 with the all new power and more effiecent supercharger it should be able to carry it to a 190 mph !

The one thing Ford will not change is the rear suspension . The unchanged rear rear end will provide a little livelier feel.The new 2013 GT500 is expected to be released about 10 month after the 2012 ZL1 that is intended to go on sale for in 11 or so months. The estimated cost for the new GT500 with over 600 horsepower is 60,000 so start saving.