I agree with Jim T. I do not think that they filter as well no matter what they claim. I've seen 4 examples (including my own) in Porsches where when removed, there is dirt in behind the filter. When I switched back to a Mahle filter, the dirt went away. I've talked with several racers who run 951's and 930's, and they will not use a K&N because of stories of chipped vanes in the turbo when running K&N's.
I hear Amsoil makes a good filter.
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