Supercars represent the apex of a brand's performance engineering, and these automobiles are designed to sell in limited numbers but attract maximum attention on the world stage. Although Europe has long been home to some of the most noteworthy supercar manufacturers - such as Ferrari and Lamborghini - America is no stranger to ultimate road legal performance stars, with not only major car companies producing fantastic rides but a number of homegrown, boutique brands also contributing to the landscape. Some of these names will be familiar, but others are usually only found at local track days, car shows, and deep in the glossy pages of publications like Grassroots Motorsports and The DuPont Registry. Let's take a look at 10 of the best American supercars.