Aug.6 (GMM) Norbert Haug has quietly praised Ferrari's strategy in integrating a blown diffuser on its 2010 car.

Mercedes, McLaren and Renault have all had problems with the Red Bull-like layout at recent races.

But Ferrari, now the closest team in terms of pace to the championship leaders, introduced its version in several phases, beginning at Valencia in June.

Even in Hungary last weekend, the troublesomely hot exhaust gases were only being blown over the top of the Ferrari diffuser, with the full effect to only be seen at the next race at Spa.

"Perhaps it was not a bad decision of Ferrari's not to rush," Mercedes' Haug is quoted by Auto Motor und Sport.

Meanwhile, Robert Kubica denied that Renault's 2010 car is still suffering from a loss of engine power due to its initial blown floor efforts.

"This is now fixed," the Pole said. "We are back at our old efficiency."

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