Heidfeld to stick with forward exhaust

Renault has reverted to using its forward facing exhaust layout on Nick Heidfeld's car for the remainder of the German Grand Prix weekend, despite some encouraging results from a new rear design in Friday practice. As AUTOSPORT revealed, Renault wanted to experiment with a Red Bull Racing-style rearward exhaust configuration to see if it would make its blown diffuser more effective and deliver better lap times. A prototype version tried out in a recent straight-line test at Duxford delivered some promising results, and the team elected to further evaluate this version - which is 4kg heavier than it should ideally be because it is not fully made on carbon fibre ? on Heidfeld's car at the Nurburgring

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