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Old 06-28-2010, 11:34 AM   #1
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K & N Aftermarket Intake

Anybody out there have experience with K&N aftermarket air intake/filters?

The numbers look good on the box ("increase up to 22HP" and 15% increase in airflow).

But I was wondering if anyone has ever acually bought, install, run, and liked it.

$149 at Pep-Boys

Lemme know whatcha think.

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Old 06-28-2010, 11:53 AM   #2
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im not sure but i was thinking of getting one too. but from what i understand the wrangler tj was built with a high flow intake. so all you would really be buying is looks

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Old 06-28-2010, 11:57 AM   #3
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Do a search and read all of the threads about this becasue there are tons. You most likely will change your mind on getting one after reading them. Good luck.
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Old 06-28-2010, 12:06 PM   #4
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A waste of time,money and effort.The TJ gets plebty of air thru the stock system.Plus there are tons of people disapointed in how much crap gets thru the filter.And it makes it easier to suck in water and hydrolock your motor.Not a good investment
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Old 06-28-2010, 12:18 PM   #5
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Not only is Jeepzcb09 correct about the TJ's stock air intake already being able to provide more air than the engine can consume, really, the K&N has been lab tested under ISO conditions and shown to be about the worst possible at the job of actually filtering the air. It passes way more dirt, silica, etc. than any other filter in the tests.

Before I read that test, I had already removed my K&N air filter after I discovered the grime it was letting past it. The inside of my air intake tube and throttle body was coated in grit from my desert wheeling after installing the K&N. Because my OBA system prevented me from going back to the OE air intake system, I ended up placing two prefilters over the top of the K&N before the inside of the air intake tube and throttle body stopped looking like a sandy beach.

Once I found a different type of filter that could directly replace my K&N, I did so. My K&N now rests in my parts box of shame that also includes a throttle body spacer someone gave me to try.
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Old 06-28-2010, 07:23 PM   #6
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Quote:
Originally Posted by Gumpy2030 View Post
Do a search and read all of the threads about this becasue there are tons. You most likely will change your mind on getting one after reading them. Good luck.
Exercise caution in suggesting the use of "search". I did it to help someone find more answers to their question than that one thread contained and got flamed by 4Jeepn.
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Old 06-28-2010, 07:38 PM   #7
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Nah, no flames.
But I try not to waste peoples time by asking redundant questions.
Prior to posting, here, I ran a thread search for "K&N" and for "K & N" and found NO prior threads.
I thought that was odd, given the popularity of K&N systems with outfitters.
I figured there would be lots of chatter for me to monitor and get the benefit of other peoples experience on the topic.
But, again, I was unable to locate any....so I just asked, for myself.
Thanks, all, for your feedback, and for saving me $149 and the time to install it.
I think I'll use part of that savings to become a paid member.
This place has saved me LOTS of time and money.

Again, thanks, ALL.
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Old 06-28-2010, 07:46 PM   #8
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Here's the secret to finding threads that have short search arguments that are too short for the search engine... put an asterisk before & after. Use *K&N* instead and you'll find 14 threads related to it. Jeep Wrangler Forum - Search Results
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Old 06-28-2010, 07:58 PM   #9
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Ahhhh... GOTCHA.

Another lesson learned.

THX !
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Old 06-28-2010, 08:23 PM   #10
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Anyone have more detail on what other filters they're using? Bought my jeep used and it came with a K&N, and I have considered replacing it - but I don't want to lose the extra space gained by the smaller filter.
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Old 06-28-2010, 08:44 PM   #11
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Dunno, Fiend.
With the K&N shot-down, I figured I'd stay with the factory box but route a 1.25" flexible "snorkle" around to the front of the radiator (under the hood) so I can pull cooler air for the intake.
I doubt I'll gain much...maybe only 20-30 degrees. And I'll be sure to orient it downward to avoid andy ram-air water infiltration.
But....It gives me an excuse to tinker with my new jeep and dust off my mad-scientist hat and start inventing.
Gotta love the jeeps flexibility, compatibility with modification, and tollerance for who-knows what sort of random crap I'll manage to hang on it.
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Old 06-29-2010, 10:09 AM   #12
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ok...well...doesnt look like my idea of routing an intake "hose" to suck cool(er) air from in front of the radiator is gonna work...not enough space to penetrate without constricting the air passage.

The only thing I could do was rotate the intake horn from 10-o'clock to 2-o'clock to reduce restriction.

I may also cut a 1.5" hole in the lower half of the filter box to give it a little more air.

Still thinking-on how to get it some COOLER air. But for now I'll be happy with MORE air.
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Old 06-29-2010, 10:50 AM   #13
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But for now I'll be happy with MORE air.
Trust me on this, as opposed to many vehicles whose air intakes are restrictive, the TJ's air intake was specifically designed to be totally NON-restrictive. The stock OE air intake is fully capable of providing more air than the 4.0L engine can consume at redline rpms and wide open throttle. Really.
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Old 06-29-2010, 10:55 AM   #14
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If anyone wants to keep their cold air intake and just get rid of the K&N filter, Amsoil sells some nice replacement filters. They do not use oil, which I also like better.
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Old 06-29-2010, 11:00 AM   #15
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Awsome.....less for me to have to "fix".

Lol.....so....just maybe.....those jeep engineers knew more about designing intakes than I do.



It is kinda wierd, though, that the the factory hole in the box is about 2.5" diameter but necks down to about 1.25 opening in the horn.

Admittedly with the engine at idle, I put my hand in front of the factory intake and was suprised to find that it sucks harder than....uhhh....most other intakes I've encountered.

THX for the heads up.....I'll go find something else to tinker with.
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Old 06-29-2010, 11:15 AM   #16
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It is kinda wierd, though, that the the factory hole in the box is about 2.5" diameter but necks down to about 1.25 opening in the horn.
Yeah that does seem funny it can draw enough air through the trumpet, as it is called, but it does. The function of the trumpet is to speed up the air flow for two reasons... 1) It helps insure better combustion by better air/fuel mix and 2) the higher velocity helps keep the engine sounds from escaping via the air intake which quiets the air intake sounds considerably.
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Old 06-29-2010, 11:44 AM   #17
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OMG! Another DUH moment for me...

Fluid Dynamics!!!! I am such a moron.

The trumpet compresses the air at the mouth, but as it enters the body of the trumpet the air then expands...

....AND COOLS!!!!!

Gasses cool as they expand. DUH

So....my efforts to design a gizmo to draw intake cooler air for combustion....is ALREADY accomplished by elementary physics.

Gosh...the view is a lot better once I pull my head outta my....uhhh....

Thanks again for letting me expose my idiocy and pointing me in the right direction....without making me feel completely ignorant.
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Old 06-29-2010, 12:02 PM   #18
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What about a K&N Filter in the Factory Box ?
Does that allow dirt to pass ?
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Old 06-29-2010, 12:16 PM   #19
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What about a K&N Filter in the Factory Box ?
Does that allow dirt to pass ?
K&N uses the same filtration material throughout their line of filters so their square replacment filter will filter the air precisely the same (and just as poorly) as their cone filters do.
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Old 06-29-2010, 12:54 PM   #20
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i have a k&n drop in filter cost me 55bux and it did give me a TINY bit more mpg nothing like crazy noticeable but the needle does seem to go down a bit slower. aha
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Old 06-29-2010, 01:00 PM   #21
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i have a k&n drop in filter cost me 55bux and it did give me a TINY bit more mpg nothing like crazy noticeable but the needle does seem to go down a bit slower. aha
The K&N did not cause that gain in mpg. Really, there is no way it could have. Don't swallow K&N's hype, it's simply not true for a free breathing air intake like the TJ's is.
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Old 06-29-2010, 01:08 PM   #22
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I'm glad Jerry was here to steer some wayward souls back to the path of enlightenment.

I wish someone would have steered the P.O. of my Jeep...it had a shotty "cold air intake" on it. I trashed it, and replaced w/ an OEM intake and Amsoil filter.

I shudder when I think of the possible damage my engine has endured while that POS filter was on it.

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