I run a K&N for the purpose of saving money over a long period of time. I don't notice much in hp gain and haven't seen any increase in mpg. So for those looking for mpg and hp gains from a drop-in...is it worth it for them to put out the 50 bones?

Has anyone had substantial gains in mpg or hp?

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06 KJ Sport
-245/75/16 Destination A/T's
-Debadged and decaled
-Liberator door handles

I have one as well, and I would have to say that the only benefit that it has over a stock paper filter is that it's washable and will last the life of the vehicle. I'll probably order an Amsoil filter one day since it's a foam filter and filters better. My 2 cents.

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02' KJ Limited/Frankenlift I HD Coils
245/75 Big Foot A/T's on Soft 8's
EBC Greenstuffs 7000
K&N Air Filter
Full set Mopar skids
Sirius Sat Radio
Cheapa$$ Subwoofer
Custom pinstripes:)

Put in an Amsoil drop-in a while back and noticed zero gains in anything.. Oh well, at least its reusable.

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A Jeep and a couple Fords.


I would wreck Kate Hudson.

We've been over this a couple of times, the K&N lets to much dust through.

Get an Amsoil filter. I have one and couldn't be happier. And no, you don't get +50 hps from an airfilter only.

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Cherokee 2,5 CRD: sold - Wrangler TJ 2.5: gone - Touareg V10 TDI: new toy

Solo Liberty en Español: Jeepliberty.es

Amsoil, took me a while to come around but couldn't be happier and yes I ran and tried K&N , not worth it

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MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 FALKEN WILDPEAK AT3W / 4.10's etc, 04 Kilimanjaro Edition loaded, plus 05 KJ limited

x2

I did the same thing. Kept getting oily MAF sensor. And yes. I have used K&N for years and didn't over-oil the filter. Just doesn't seem to be a good match for the KJ. I have Amsoil now and working great.

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2007 Light Khaki 4x2 Sport
- Debadged - LTT CAI with Amsoil Filter - JVC HD Radio - Infinity BassLink
- Iggee Seat Covers - Black Moabs - 265/75-16 Cooper Discoverer ATP - 4.10's
- DIY Franky sitting at 23.75" - Al's 4.5 UCAs - Trimmed F&R Bumpers
- Removed Rear Sway Bar - Removed Rear Vibration Damper
- 75k miles so far...

I try to use WIX filters.. You won't get an increase in MPG or "usable" horsepower from the filter so just buy one that actually filters the incoming air.

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02 Liberty Limited
Silver Outside & Taupe Inside
Heated Seats, Sunroof & Infinity speakers
USA Spec I-Pod adaptor, Mopar Sub, Garmin GPS
Tow Package, Select-Trac
Rock Rails, Tow Hooks

I have a K&N in. I think it dropped my gas mileage (made it worse) but I feel the Jeep is gutsier.

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Joe
L.O.S.T. #000391
2000 Jeep Wrangler Sport with hooks, skids, trac-lok rear.

If the air filter is clean enough it will flow more air than the engine can use. NO air filter will truly increase HP or MPG just by switching but May show increases Over a dirty, used up filter.

So how much does a reusable filter degrade over time? An oiled cotton gauze must wear over time right? You oil it, load it with dirt, apply a cleaner then rinse it out, air dry it, repeat....... so who doesn't think that it's filtering ability and flow characteristics would change over time by being treated that way? Fabrics wear out. How about that seal around the perimeter of the filter? Sure it wears too right?

I even agree that the Amsoil Ea filters wear out over time but I also know that they were made to be cleaned only every 25K miles over the course of a 100K mile life cycle of Road use. Now add in more frequent cleanings due to exposure to off roading conditions, more dust, etc. and is Their life shortened? darn right.

So what do you do? Well, I run an Amsoil Ea series drop in air filter that is proven to flow well, filter great and be reusable. It is also a good compromise of value over throw away air filters. Even if I only get a years worth of use out of it, I would probably change a throw away every 3 months due to frequent off road use. so I get what I feel is a better filter for $45 or less and can run it all year ++ w/ out worry.

fwiw, I have a customer that did UOA on his Jeep every 5k miles or so and he noticed much better silica readings using an EA series Amsoil over an OEM type filter. Even though the readings got a little worse each time he had a UOA done the reading was still better than the readings w/ the OEM. He surmised that the Amsoil filter was a better value even if he only ran it to 50K miles since it still improved his oil analysis readings and over time was cheaper than OEM filters. Peace of mind and good value for him.

Is this info true for Every application and every user? Of course not but there is way too much evidence against oiled cotton gauze, Old technology, air filters to even consider them any more Especially for off road use when the Non-oiled filters have proven to be better.

of course, ymmv.... thats all I have to say about that.........

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99 TJ
71 C101
04 KJ
03 SFA KJ Sport
LOST JEEPS So-Cal

k&n is working for me. i can feel the hp increase at lower rpms and my gas mileage went up .4. i was using a $15 filter from pepboys so i may have been coking out the car before

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