Correction: An earlier version of this story incorrectly reported the starting price for Ford Mustangs and the horsepower of the GT350.

New York CNN Business —  

Ford had promised the Mustang Shelby GT500 would be its most powerful factory-built car ever. Now we know how powerful.

The GT500 will go on sale in the fall. Combined with a seven-speed automatic transmission, its supercharged V8 engine will enable the car to go 0 to 60 in about 3.5 seconds, according to Ford. Manual transmission will not be offered.

That engine will allow the GT500 to go from 0 to 60 in about 3.5 seconds, according to Ford.

Ford hasn’t yet said how much the new GT500 will cost. The most powerful version of the Mustang Ford currently produces is the Shelby GT350 which has a 562 horsepower engine. Prices for that car start at about $59,000.

Ford (F) has a complicated but fruitful relationship with the Las Vegas-based Shelby American company. Shelby Mustangs were originally made by Shelby using Mustangs supplied by Ford (F) as a starting point. Shelby still does these sort of performance conversions.

In fact, there are already Shelby Mustangs, such as the Shelby-produced Super Snake, with more horsepower than any produced by Ford. The new GT500, though, will be the most powerful ever produced by Ford itself.