Say "Ford Mustang" and most people picture a V8. Ford also builds a four-cylinder EcoBoost Mustang and a V6 Mustang, both cheaper and both sitting below the GT on the spec sheet. Those numbers made it, at the time, the quickest four-cylinder Mustang the outlet had ever tested. It's a genuinely quick car — quick enough to run down machines that wear a "sports car" badge and cost considerably more. Here are a few sports cars the base Ford Mustang EcoBoost leaves behind.