The car is powered by a turbocharged Duratec RS 2.5 engine, delivering 305PS and peak torque of 440Nm.
It has a wider track than the regular Focus, and a newly developed front suspension system called RevoKnuckle, which Ford has patented.
The company says the system negates the need for AWD in a powerful car.
Despite its power, the Focus RS returns combined fuel economy of 9.4 litres per 100km (30 miles per gallon) and an average CO2 rating of 225g/km.
It will do the 100km/h sprint in 5.9 seconds.
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