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I can tell you I did 3 dyno runs a month ago, took the Vortex breather off for my 2nd run lost 8 hp! Put it back on for the 3rd run gained it right back. :yesnod:
I can't give you a definite answer, but any of the gauze/synth elements will flow better than paper as they get dirty. I would assume the Blackwing, as it has, by far, the most surface area.
Re: Best filter (jfpilla)
