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When it comes to American muscle you don't get much more apple pie than Shelby American and Hertz. Once again, the two companies are teaming up to offer travelers across the United States access to a triad of new Mustang Shelby muscle cars with as much as 900-plus horsepower, reinvigorating their longtime Rent-a-Racer program this summer. But, are the $399-per-day price tag and additional restrictions worth the price tag? Purely for research, we hopped a quick flight to Las Vegas and the Shelby Museum to get behind the wheel of the convertible GT-H and the monstrous GT500-H on a straight highway run out to Seven Magic Mountains and back to gather more data.