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I've heard from expert posters on bitog (bobistheoilguy.com/forums) that K&N's can allow a tad too much dirt into the engine as witnessed by high silicon readings in used oil analyses (UOAs). I had a drop in rectangular one on my 1997 SAAB 900 turbo and I can't say it did much for fuel economy or performance. Paper is going to give you much better filtration.
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