Jul.22 (GMM) Mercedes and Ferrari will have improvements to their respective 2010 cars at Hockenheim this weekend.

According to German reports, the W01 is set to feature a development of its switchable F-duct system, as well as a refined blown exhaust.

"We have worked hard," confirmed competition director Norbert Haug. "We have sorted out many of the problems we've seen in the last two races."

Mercedes team boss Ross Brawn is cautious. "Unfortunately the wind tunnel can't simulate everything, like the impact of hot exhaust gases at high speed.

"But if everything works as planned, we can be confident," he is quoted by Auto Motor und Sport.

Also primarily in the area of the blown diffuser, Hockenheim is another step in Ferrari's developments that began at Valencia.

"On Friday we'll see if it brings the effects we hope for," confirmed Fernando Alonso.

Renault's Robert Kubica is predicting a difficult German grand prix.

"Most of the teams we are racing now have both the F-duct and the blown floor, so I think it could be quite a tough weekend," said the Pole.

Italy's Autosprint reports that, after the August break, another wave of major improvements will be added to the Ferrari.

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