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Old 03-20-2012, 04:31 AM   #1
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Air filter

Hi guys, looking to change my stock air filter in my 04 wrangler 4.0. Any suggestion on which one to go with?

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Old 03-20-2012, 05:18 AM   #2
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This is a can of worms you're about to open. Some say air filters aren't worth the money, some swear by them. Do some research other than this website, I know JP mag did dyno tests for the major companies on air intakes. The air raid cold air intake came out on top performance wise in a wrangler tj. Also with upgrades you can't stop at just an upgraded air intake you have to get new headers, cat back exhaust, etc to feel any difference in performance. Make sure that everything you do though is either 50 state legal or legal for your area. Pain in the ass? Welcome to the world of jeeps. I personally went with an air raid intake and JBA cat back exhaust the headers are coming next. Happy hunting.

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Old 03-20-2012, 07:14 AM   #3
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Thank you for your suggestion EMSRubi. But I'm just trying to swap my old dirty filter. Not planning to change the whole intake.
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Old 03-20-2012, 07:31 AM   #4
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I'd just go with a stock paper filter.
I have a K&N in my Jeep, but only because it was there when I bought the jeep. I'm giving serious thought to swapping over to a normal paper filter as generally, they do a better job of keeping garbage out of the motor.
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Old 03-20-2012, 01:05 PM   #5
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I say paper, but I have no science talk to back up my suggestion. I just removed my K&N and replaced it with a paper filter last week. I didn't want to mess with servicing the K&N so I just picked up a parer unit. My TJ had the K&N when I bought it and I ran it for 8 years but after reading far more peoples suggestions to use a paper filter I decided to switch.
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Old 03-20-2012, 01:23 PM   #6
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I have a NAPA Gold 6081 in mine.
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Old 03-20-2012, 01:27 PM   #7
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AC-Delco. Purolator, and Fram all make very good paper element OE replacement air filters. AC-Delco seems to come in at the top of the various paper element air filter tests I've ever read.
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Old 03-20-2012, 01:31 PM   #8
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I Just put a fram in my 10 yr old jeep after buying it and realizing it had the factory filter in it.
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Old 03-20-2012, 01:41 PM   #9
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I got a spectre filter from pepboys it's like a K&N one you can reuse it. I payed 20 bucks for it? Pretty nice looking and does it's job.
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Old 03-20-2012, 01:44 PM   #10
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Originally Posted by spy View Post
I got a spectre filter from pepboys it's like a K&N
If it is ANYTHING like a K&N air filter, it will never see the inside of any of my Jeep engine compartments. One K&N air filter was more than enough for me.
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Old 03-20-2012, 04:26 PM   #11
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I got a spectre filter from pepboys it's like a K&N one you can reuse it. I payed 20 bucks for it? Pretty nice looking and does it's job.
The one that fits in the factory air box or the round cone shaped ones? If you have the one that fits in the air box it should be fine for driving on the street. The air box provides a sort of plenum area for debris to settle before getting sucked into the filter.
That Spectre could however be your Jeeps worse enemy if you take it into any dusty off road areas as it will allow too much dirt through.

Myself, I choose to use a regular old fashion (Puralator: Pure One or Wix) filter with a Wix air flow monitor installed in the air box.



By the way... that plenum is what causes the issues with stock air boxes and water. The water gets in the air box and then has to drain through the tiny hole in the bottom of it.

Imagine that full of water... the air would have to pass through the water in the intake pipe and the box before getting to the filter.
With this...

The air passage is cleared as soon as the vehicle is no longer under water.
However, it doesn't filter the air as well. These oil filter were designed for street cars to increase air flow and horse power, they didn't need to filter the air as well as an off road vehicle does.


From what I have learned about Jeeps the stock air box is not as restrictive as most vehicles. Try putting your fingers over the opening while the engine is running, you'll feel the air flow.
Take a look at at some other vehicles air boxes, like the Ford Ranger for example. The intake hole in the air box is tiny. But on a Wrangler it is pretty big.

I have however been looking into these. Amsoil Ea Synthetic Nano filters. They claim to be the same technology they used in the Abrams M1 tank air filters.
AMSOIL Ea Synthetic Nanofiber Air Filter (EaA)
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Old 03-20-2012, 04:47 PM   #12
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Imagine that full of water... the air would have to pass through the water in the intake pipe and the box before getting to the filter.
Like a bong!
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Old 03-20-2012, 04:49 PM   #13
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Like a bong!

pretty much, yep.
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Old 03-20-2012, 04:55 PM   #14
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Quote:
Originally Posted by EMSRubi
This is a can of worms you're about to open. Some say air filters aren't worth the money, some swear by them. Do some research other than this website, I know JP mag did dyno tests for the major companies on air intakes. The air raid cold air intake came out on top performance wise in a wrangler tj. Also with upgrades you can't stop at just an upgraded air intake you have to get new headers, cat back exhaust, etc to feel any difference in performance. Make sure that everything you do though is either 50 state legal or legal for your area. Pain in the ass? Welcome to the world of jeeps. I personally went with an air raid intake and JBA cat back exhaust the headers are coming next. Happy hunting.
True statement!

Go ahead an swap out for a decent stock filter now. Then start saving for a better system - I have the AirAid CAI, throttle body spacer and a Cat Back exhaust on my 4.0L. Significant gain in performance, economy and sounds great! Well worth the money if you intend on keeping her for a while!
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Old 03-20-2012, 10:16 PM   #15
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I've been using Napa Gold (since I removed my Truflow foam filter), it looks exactly like the pictures of the Wix filter... only place that has AC Delco in stock locally wants 30 bucks for it, and I doubt it's twice as good as Napa
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Old 03-20-2012, 10:42 PM   #16
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Quote:
Originally Posted by commodore_dude View Post
I've been using Napa Gold (since I removed my Truflow foam filter), it looks exactly like the pictures of the Wix filter... only place that has AC Delco in stock locally wants 30 bucks for it, and I doubt it's twice as good as Napa
I picked up my AC-Delco filter on eBay for $11 shipped
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Old 03-20-2012, 10:56 PM   #17
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Quote:
Originally Posted by Dragonii View Post
The one that fits in the factory air box or the round cone shaped ones? If you have the one that fits in the air box it should be fine for driving on the street. The air box provides a sort of plenum area for debris to settle before getting sucked into the filter.
That Spectre could however be your Jeeps worse enemy if you take it into any dusty off road areas as it will allow too much dirt through.

Myself, I choose to use a regular old fashion (Puralator: Pure One or Wix) filter with a Wix air flow monitor installed in the air box.



By the way... that plenum is what causes the issues with stock air boxes and water. The water gets in the air box and then has to drain through the tiny hole in the bottom of it.

Imagine that full of water... the air would have to pass through the water in the intake pipe and the box before getting to the filter.
With this...

The air passage is cleared as soon as the vehicle is no longer under water.
However, it doesn't filter the air as well. These oil filter were designed for street cars to increase air flow and horse power, they didn't need to filter the air as well as an off road vehicle does.


From what I have learned about Jeeps the stock air box is not as restrictive as most vehicles. Try putting your fingers over the opening while the engine is running, you'll feel the air flow.
Take a look at at some other vehicles air boxes, like the Ford Ranger for example. The intake hole in the air box is tiny. But on a Wrangler it is pretty big.

I have however been looking into these. Amsoil Ea Synthetic Nano filters. They claim to be the same technology they used in the Abrams M1 tank air filters.
AMSOIL Ea Synthetic Nanofiber Air Filter (EaA)
You are correct sir, I use that air filter for normal driving on the street!
I bought it for easy Maintenance of the filter. Also If I got offroading I always try to stay just up to my wheels in the water, or the lower part of my rocker. I will agree that a paper filter is the way to go if your going to be going into a lot of "Dirty environments where dust and a lot of particles are present. I used intakes on all my vehicles before this but as you stated the jeep air box is sufficient for my needs.

good luck to the op in your decision! and it was a rectangle drop in filter not a cone that I used.
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Old 03-20-2012, 11:34 PM   #18
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Originally Posted by commodore_dude View Post
I've been using Napa Gold (since I removed my Truflow foam filter), it looks exactly like the pictures of the Wix filter... only place that has AC Delco in stock locally wants 30 bucks for it, and I doubt it's twice as good as Napa

I used to work for NAPA back in the late 90's..... their filters were re-badged Wix back then so I assume they still are today.
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Old 03-20-2012, 11:37 PM   #19
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Originally Posted by mister_hudson

True statement!

Go ahead an swap out for a decent stock filter now. Then start saving for a better system - I have the AirAid CAI, throttle body spacer and a Cat Back exhaust on my 4.0L. Significant gain in performance, economy and sounds great! Well worth the money if you intend on keeping her for a while!
I just installed an AirAid CAI and a Poweraid throttle body spacer n my 4cyl YJ today and LOVE IT!!!!!!!
I'm so proud I did it myself!
I need to get myself some more tools!!!!!
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Old 03-20-2012, 11:50 PM   #20
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Guys, just a thought. I don't know if a cold air intake will benefit in a damn hot tropical weather country.
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Old 03-21-2012, 09:08 AM   #21
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Originally Posted by MickeYJ View Post
I just installed an AirAid CAI and a Poweraid throttle body spacer n my 4cyl YJ today and LOVE IT!!!!!!!
I'm so proud I did it myself!
I need to get myself some more tools!!!!!
Nice job but be aware that throttle body spacers do literally nothing for performance, mpg, etc. when installed under the type of throttle body the various TJ engines use.

Spacers can do wonders when placed under the old style of throttle body that had a fuel injector in it (called throttle body injection or TBI) and carburetors but not under the air-only type of throttle body the TJ has.
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Old 03-21-2012, 09:13 AM   #22
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Originally Posted by Jerry Bransford
Nice job but be aware that throttle body spacers do literally nothing for performance, mpg, etc. when installed under the type of throttle body the various TJ engines use.

Spacers can do wonders when placed under the old style of throttle body that had a fuel injector in it (called throttle body injection or TBI) and carburetors but not under the air-only type of throttle body the TJ has.
Mine is a YJ no TBI.
But oh well, I do feel it respond a bit different than pre installation.
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Old 03-21-2012, 06:18 PM   #23
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I would prefer the throttle body over a performance chip or programmer. Those things are a waste.
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Old 03-21-2012, 07:40 PM   #24
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Originally Posted by SinfulDragon View Post
I'd just go with a stock paper filter.
I have a K&N in my Jeep, but only because it was there when I bought the jeep. I'm giving serious thought to swapping over to a normal paper filter as generally, they do a better job of keeping garbage out of the motor.
x2.
i have a k&N cold air intake. because it was installed when i got it. havent heard great things about K&N.
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Old 03-21-2012, 11:50 PM   #25
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...I have however been looking into these. Amsoil Ea Synthetic Nano filters. They claim to be the same technology they used in the Abrams M1 tank air filters.
AMSOIL Ea Synthetic Nanofiber Air Filter (EaA)

It's been discontinued, not sure why.
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Old 03-22-2012, 01:30 AM   #26
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Originally Posted by MickeYJ

I just installed an AirAid CAI and a Poweraid throttle body spacer n my 4cyl YJ today and LOVE IT!!!!!!!
I'm so proud I did it myself!
I need to get myself some more tools!!!!!
Congrats! I noticed a nice difference in throttle response with the CAI - upgrade the exhaust the next chance you get and you'll fall in love all over again! Just be sure that filter doesn't get too dirty or you'll suffocate the engine...
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Old 03-22-2012, 01:36 AM   #27
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Originally Posted by mister_hudson

Congrats! I noticed a nice difference in throttle response with the CAI - upgrade the exhaust the next chance you get and you'll fall in love all over again! Just be sure that filter doesn't get too dirty or you'll suffocate the engine...
Upgrading the exhaust is when the fun starts.
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Old 03-22-2012, 01:36 AM   #28
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I got a spectre filter from pepboys it's like a K&N one you can reuse it. I payed 20 bucks for it? Pretty nice looking and does it's job.

same here the cone kind
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Old 03-22-2012, 01:46 AM   #29
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Is part number A1548C the right AC Delco for an 04 Wrangler I6? Sorry for the thread jack, but since we're talking filters.....
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Old 03-22-2012, 02:03 AM   #30
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I'm just trying to swap my old dirty filter

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