The controversial diffusers that helped Brawn GP win the opening two races of Formula One will be used again at the Chinese Grand Prix. FIA approved the use of the part Wednesday.

The FIA's International Court of Appeal ruled that the rear diffusers are legal and "comply with the applicable regulations." It rejected an appeal by four teams against the technology, which channels the flow of air from the front to rear, and helps create greater downforce through corners.

The decision was a victory for diffuser users Brawn GP, Toyota and Williams.The ruling means the teams will keep the points they won in the first two races, with Button leading the drivers' standings after victories in Australia and Malaysia.

Currently Brawn leads the constructors' championship with 25 points, followed by Toyota and BMW. Ferrari sits at the bottom with zero points.