Remember the legendary Hertz "Rent-a-Racer" Shelby Mustangs of the '60s, rumored to have been returned with swapped-out six-cylinder engines? Well, Hertz is back in the news with their Shelby ...

Remember the Hertz "Rent-a-Racer" Shelby Mustangs of the '60s? The ones that in the 60s had a reputation for having customers take out their engines and return them to Hertz with a six-cylinder ...

Remember the Hertz "Rent-a-Racer" Shelby Mustangs of the '60s? The ones with a reputation for having customers take out their engines and return them to Hertz with a six-cylinder instead?