Veteran racer Mattias Ekström campaigns the meanest looking Audi S1 on the block in the FIA World Rallycross Championship . With a 2.0-liter turbocharged four-cylinder pumping out a claimed 600 horsepower and all-wheel drive, this little hatch can reportedly hit 60 miles per hour in a wickedly quick 1.9 seconds.While those specs are mighty impressive, they don't really matter too much for Ekstrom's latest race in the S1 against a pint-sized doppelgänger in the form of an RC replica of the rallycross machine around a warehouse.Despite, the massive gulf in size and power, the two Audis appear fairly evenly matched. The RC version can't quite match the real one in outright speed but can go under obstacles that Ekström's S1 is forced to drive around. Check out the clip above to see which S1 makes it to the finish first.