The Factory Five 818 is a kit car: You source the guts of the manifestly excellent Subaru Impreza (cheap and plentiful, used), and Factory Five supplies the sexy body. Then you get to work in the garage. A few scraped knuckles later, you drive off in a featherweight, mid-engine race car. It's the kind of vehicle no mainstream company could build, not least for $15,000. Which is why you'll have to do it yourself. [$15,000; factoryfive.com]