The F-duct normally improves straight-line speed but at Monza it is helping to improve cornering speed while the flatter, Monza-spec wing actually makes the car quicker on the straights.
Red Bull are running with a new 'double' diffuser in the Principality while championship leaders Brawn also have a series of modifications, including a new rear wing configuration, changes to the car's suspension and a reconfigured chassis to suit the tight, twisty track.