Williams has confirmed that it will run KERS on both of its cars during this weekend's Hungarian Grand Prix having run Rubens Barrichello without the device in Germany.

The team elected to run Barrichello without KERS at the Nurburgring in order to see the effect it would have on tyre degradation, although team-mate Pastor Maldonado ran with KERS to allow the team to complete a back-to-back comparison.

However, the team has now confirmed that KERS will be fitted to both cars for the Hungarian race while new rear bodywork will feature on the FW33s as Williams seeks to score for the only the third time this season.

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"Budapest is a high downforce circuit, with lots of slow speed corners," technical director Sam Michael said. "It has quite a bumpy track surface compared to normal. Usually there is a reasonable improvement in grip as the weekend progresses due to the dusty nature of the circuit. We will have new bodywork to test on the Friday, and we will also run KERS on both cars.

"[In Germany] we wanted to do a race weekend without KERS on one car to see the effect it had on tyre degradation due to the engine braking maps that we have to run. Obviously there is also a weight trade-off with KERS, so by not running it you gain a lot of ballast."

Both Barrichello and Maldonado have enjoyed success in Hungary in the past and even though the circuit isn't renowned for action-packed racing, Maldonado said the Hungaroring was a venue he enjoyed.

"I really like the Hungaroring and I won the main race last year in GP2," he said. "The track is really slow speed so we might need to change our set-up quite a lot to adapt to that kind of circuit. There isn't a single corner I like more than any other, I just like the track as a whole. I think it will be a hard weekend but I hope we can improve the car."