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Of course, there are those who'll argue that a "polluting" race car is cleaner and more economical than most road cars, as a lot of the stuff on the road car engines sap power and effency as far as the pollution controls. Even at that, GT3 cars and Super GT cars have to run catalyic converters (broadly what a particle filter is).
If the Pugs start to smoke (which some say that they turned up the wick in session two to match the Audi times), look for the ACO to turn a blind eye. It should be noted that the R15s at Sebring were smoking big time at low speeds (far worse than the R18s), and no one cared there.
Either it's the deal with one filter, or Audi were running rich, or when the engine isn't being pushed, the one filter is enough, but the back pressure from the turbo/turbos/compound turbo (whatever Audi has!) is blowing all the soot out that's normally collected when the engine is on wide open throttle on accelleration.
But then again, the thing on the R18's exhaust that's about the size of a muffler should be the particle filter, right?
PS: AMR have no room to complain this year, since the ARM-One seemed to smoke worse than anything out there by munching it's own cylinder liners.
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