Friday 18 June at 18:01 : Jun.18 (GMM) Red Bull is bidding to return to dominance on the streets of Valencia next weekend by using an F-duct system.

With Red Bull earlier looking set to walk the 2010 title, McLaren crept onto the pace in Turkey and then leapt to the top of the championships with one-two victory in Canada last weekend.

Red Bull used its initial version of McLaren's downforce-stalling F-duct concept in practice for the Turkish grand prix, but then decided to develop it further rather than take it to Canada.

Valencia, like the long straights and slow corners of Montreal, is another circuit that is expected to play into the hands of McLaren and the British team's original F-duct.

Vettel was the highest placed Red Bull in Canada with just fourth place, but on Friday he said the North American round is now in the past so that the team can "fully concentrate" on Valencia.

"There, with the F-duct system we are getting an important part on the car," he told Germany's Auto Bild Motorsport.

"Our technical chief Adrian Newey did not come to Canada in order to put the finishing touches on the new system at the factory," added the 22-year-old German.