Audi TT GT4: A Quattro Racer You Can BuyS

Audi used the Shanghai DTM race to debut a TT GT4 turnkey racer planned for production in 2012, though inexplicably called a concept. The car will feature a racing body, roll cage, fuel cell, and 340 hp TFSI engine.

The Audi Quattro Concept remains a concept, although we hear it's being built in small numbers. If you're interested in racing and don't want to wait around for Quattro Concept, the TT GT4 fits the bill nicely, assuming you can handle a $160,000 bill.