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Red Bull gives you fins 01 Feb 2008

A radical wing on Mark Webber (AUS) Red Bull Racing RB4 Formula One Testing, Day One, Barcelona, Spain, 01 February 2008. World © Bumstead/Sutton Red Bull Racing RB4 with a shark fin wing. Formula One Testing, Day One, Barcelona, Spain, 01 February 2008. World © Patching/Sutton

The Red Bull RB4 quickly established itself as the most-photographed car at Barcelona testing on Friday, thanks to a revised aero package featuring a ‘shark fin’ extension on its engine cover.

The dramatic-looking modification to the Adrian Newey-designed machine is almost certainly aimed at improving the RB4’s rear-end stability under braking - a performance area that could prove critical this year thanks to the loss of driver aids, including engine braking control.

Mark Webber was charged with initial assessment of the new aero package, while team mate David Coulthard tested a rather more conventional-looking RB4.