It also looked surprisingly cool, thanks in part to the re-designed front fascia, an angled rear diffuser, a slight spoiler and 18-inch R-Design wheels.

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Last season, Button and the Brawn GP team, helped by their revolutionary rear diffuser, won six of the first seven races, but experts are predicting a much closer tussle this year.

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The exterior also utilizes a flat underbody (including a large front flat floor cover, electric motor area undercover, front undercover and rear diffuser with fins) to help manage airflow under the vehicle.

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Brawn dominated the start of the season, with Button winning six of the first seven races, and they found themselves caught in a controversy over the design of their car's rear diffuser, which several rivals said contravened the rules.

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The new development uses exhaust gases to move the airflow around the diffuser and rear beam wing more effectively.

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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.

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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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Before Toyota were demoted to the back of the grid in Melbourne for running with an illegal rear wing, six of the top eight cars in qualifying ran with the split-level diffuser.

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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.

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