After reading as much as possible about the K & N air filter system for mileage and horsepower inprovement, I bought and installed one this weekend. I know, I know, don't go through deep water with it!!
Having said all of that, I put it on the KJ. I also have a free-flowing exhaust installed so with the two parts working together, it sounds like it means business.
My first road test had me grinning - It really does have a quicker throttle response with more "get off the line" startup horsepower. The top end seems better too. I am happy with my choice. Since I use my Jeep for a daily driver, I was looking for a little more freeway merging boost.
Final piece to be installed will be some NGK double-platinum plugs.
I will be watching for miles per gallon increases as well.
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Lifetime Member # MD065525
http://www.hcp4x4.com/searchslide.asp?id=73
Old Man Emu suspension. Jeep Rubicon tires and wheels. ARB Bull Bar with Warn Tabor 9K winch. Manik tail light guards. factory skid plates and light bar.