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Main problem with the R15 at Le Mans last year was trash getting into the intercoolers, probably due in part to the louvred sidepods. The screen infront of the radiators caught the stuff from under the nose of the car, but not the stuff that went over the sidepods and into those louvres. Hence why Audi has closed off the sidepods(also to reduce drag) and made it easier to clean the radiator intakes. Also, reportedly, the R15's front diffuser has numerous tuning vanes/vortex generators to function as stakes instead of two big stakes, but they also help filter out the debris from the track as well. The LM spec 908 gets most of it's air in much the same was as the R15 does now-from under or around the front diffuser.
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