I love all of the talk about voiding warranty on this thred. I guess it would be a concern if you aren't doing anything other than the filter. In my case, if I bought my jeep new, my warranty would be gone almost immediately what with wanting to do a suspension lift, intake, exhaust, wheels, tires, etc...... I like the K&N FIPK's. Had them on all my vehicles from a 2001 Audi TT Quattro to a 2006 F150. In every case I definately saw increased throttle response, increase in acceleration and if I could keep my foot out of the vehicle an increase in gas milage. I have had many discussions with installers and shops and the warranty condition comes down to the question "did the aftermarket part cause the failure?" If it did then you are done. If not then in a court of law the warranty will be up-held.....Of course is it worth a court battle over? probably not so you could be done anyway. LOL My opinion - If you are looking for something fun to add, as most of us are, then its a great buy. If you are looking to do it because you are hoping for some miracle cure to gas milage.....the Honda Prius might be a better answer.