The new Range Rover Sport SVR puts out a storming 542bhp - but how does it compare to the Porsche Cayenne Turbo on the track?

See the Range Rover Sport SVR take on the Porsche Cayenne Turbo and Audi RS6 here - http://www.autoexpress.co.uk/land-rover/range-rover-sport/91149/range-rover-sport-svr-vs-porsche-cayenne-turbo-audi-rs6