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K&N



  With the grit in there, most likely, the filter was not installed
  correctly at some point, did not get a good seal all the way around. I've
  seen this before in Audis where the filter is so very difficult to get
  at. "Grit" is MUCH too large to get *through* the filter, but not around
  it! Datapoint: Ur-Q w/190,000 miles, K&N since 55,000 miles, no grit, no
  valve problems, no filter related problems at all. On performance, turbo
  lag is less with the K&N Vs paper, boost comes up much faster & higher. I
  think the K&N is a win.

  -glen