Deliveries have barely started for the 2013 Ford Shelby GT500 yet we’re already hearing of cars being tuned for more power! For those that don’t follow the muscle car scene, Ford’s Shelby GT500 was announced earlier in the year with a staggering 662 horsepower and 631lb-ft of torque. That makes it more powerful than a Ferrari 458 Italia by 100hp and only 38hp off Lamborghini’s Aventador! By comparison, Chevrolet released their Camaro ZL1 at the 2011 Chicago Auto Show with just 580hp!

Still, this high horsepower figure is still not enough for some customers. Ford Mustang specialists, Lethal Performance, managed to get their hands on one of the first copies, delivered on 14th June 2012. They dynoed the car and got a figure of 590hp from the rear wheels, from this, they set about improving the car!

First modification was a Lund SCT tune and a new three inch midpipe for the exhaust system. At this early stage, not much else is available so Lethal Performance also fitted a 150hp boost of nitrous oxide. The result is what you see in the video below. The final figure was 763.9 rear wheel horsepower and 859.9ft-lb’s of rear wheel torque. From start to finish, 173.9hp of gain, all measured on the dyno!

To test it, Lethal Performance pitted it against its nearest rival, the Camaro ZL1, fetled by another tuning shot. The video produced at Palm Beach International Raceway can be seen below. The time it set was 10.582 seconds at 141.53mph.

[Via SVTPerformance]

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