One great thing about muscle cars is the ability to add more and more power to their motors, and the new GT350 Mustang->ke428 is no different. The high-speed, small block muscle car already cranks out 525 horsepower, but buyers can now turn that up to 624 horses.

The “R” tune model will top off the GT350 range and, compared to the standard model, will contain a unique engine and supercharger tuning. Shelby->ke81 has said that this new model will still be able to run on regular fuel.

“The results show that the Shelby GT350 takes American performance to an entirely new level." said John Luft, president of Shelby American.

"In recent tests, the standard supercharged car hit 60 miles per hour in just 3.7 seconds and ran the quarter in 12 seconds flat at 121.4 mph, all while generating 1.05g of lateral acceleration and stopping from 60 mph in only 107 feet. We believe the "R" tuned GT350 will be even faster.”

All of this extra power will cost around $750, on top of the $33,995 price tag for the Shelby Mustang->ke1359. That’s one hell of a steal for 624 ponies.

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