Chinese Grand Prix: F1's arms race reaches critical stage with Ferrari taking on McLaren

Ferrari driver Fernando Alonso is excited by the steps his team are taking to further improve their car. Mercedes and Williams are also thought to be close to introducing their versions of the controversial device, which means the driver closes off a valve in the cockpit by using his body, an effect that in turn helps to 'stall' the rear wing, reducing drag and giving the car a massive straight-line speed advantage.

Jenson Button tried to play down that advantage on Thursday when he claimed that the only reason his MP4-25 machine is so fast on the straights is because it is lacking in downforce, the aerodynamic effect that keeps a car glued to the track.

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"Red Bull were 14km/h slower than us

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