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With the addition of pullies to my K&N and 91 tune my car turned 300rwhp. Been very happy with it. The one advantage of the K&N, BBK, and some others is you can run the factory tune with it. And that's a plus when taking your car in for service. I flash mine back to stock each time cause I simply don't want to run the chance of them re-flashing my car or give me warranty issues.
I'm selling my K&N only cause I'm going with cams and a Airaid.