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Mercedes had arrived at their home race in Hockenheim with a modification to their exhaust blown diffuser and a new rear wing.
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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.
BBC: Rosberg sets Monaco practice pace
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Championship leaders Brawn arrived in Budapest with a major upgrade package which includes a new diffuser, rear wing and bodywork and they used Friday's first session to test their new parts with race fuel loads.
BBC: Hamilton top as McLaren set pace