Can Someone Show Me How To Do The Free Air Intake Mod On My '99 TJ? - Jeep Wrangler Forum
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Old 01-16-2011, 08:40 PM   #1
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Can Someone Show Me How To Do The Free Air Intake Mod On My '99 TJ?

I've been reading that there is a way to get better air intake by removing some restrictor. Can someone show me how to do this? My TJ is my highschool Daily Driver and this seems like a cool free mod. Please give me some instructions/pictures. Thanks a lot

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Old 01-16-2011, 08:52 PM   #2
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Normally you would take the air box out and just buy one of them round K&N or no name filters and put it on the end of the plastic stock intake.

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Old 01-16-2011, 08:56 PM   #3
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I mean i could be wrong but there really isn't anything to it when you buy a intake kit its just a aluminum intake pipe with a filter. If you want ebay sells noname kits I was going to get one myself but i take mine off roading so i think the big filter would suck in faster then the stock one.
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Old 01-16-2011, 09:47 PM   #4
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DO NOT MODIFY YOUR INTAKE!

It is designed to flow with no unnecessary restrictions unlike most other vehicles. "Cold air intakes" are a waste of money and are in many cases, not as good as the OEM intake (water can now get into the engine easier, filters allow more dirt into them, etc, etc).

That is all.
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Old 01-16-2011, 09:55 PM   #5
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Old 01-16-2011, 09:57 PM   #6
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I used to be just like you with my first car (93 buick century lol) and i ended up with a trashy teen car.

rather then spending little money here and there, save it up a bit and start doing Maintanince by the owners manual. Something cheap you can do is buy some grease and start greaceing all your suspension and battery terminals and other exposed things.

wash it as often as possible to keep mud and salt building up so it does not rust.

keep it nice so when your making some money later you can do big projects.

plus having a reliable daily driver is more important then one with cool nick nacks.

or if you want, buy some gear to keep you out on the trail. a tool kit/survival kit to keep in the jeep.

edit: saw your other thread about doing cheap/free stuff. I dont mean to be off topic
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Old 01-16-2011, 10:17 PM   #7
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Really, as hard as this may be to believe, there is no free or inexpensive air intake modification that will help your TJ's performance. Really. Unlike some cars whose air intakes truly are restrictive, many of which were designed to be restrictive, the TJ's is not restrictive... not in the least. It was specifically designed to be completely free breathing so no mod is going to improve upon that. Reall.
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Old 01-17-2011, 09:07 AM   #8
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Originally Posted by JeepNamedTJ View Post
I've been reading that there is a way to get better air intake by removing some restrictor. Can someone show me how to do this? My TJ is my highschool Daily Driver and this seems like a cool free mod. Please give me some instructions/pictures. Thanks a lot
I've heard pretty much all the air intake BS myths, and I can tell you there is no restrictor in the TJ's intake system. And I can tell you changing it to a cold air intake and/or K&N filter can actually make things worse.

Get some education here:
FAQ - Cold Air Intake - JeepForum.com
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Old 01-17-2011, 09:14 AM   #9
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So the air intake mod is a big joke. I understand. I think I'll just save my pennies and do easy work. Maybe eventually a nice bumper with fog lights. Right now I have to fix the front fenders. Typical rust but I'm thinking about bondo and then having a friend diamond plate
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Old 01-17-2011, 09:26 AM   #10
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So the air intake mod is a big joke. I understand. I think I'll just save my pennies and do easy work. Maybe eventually a nice bumper with fog lights. Right now I have to fix the front fenders. Typical rust but I'm thinking about bondo and then having a friend diamond plate
Well I'm glad you gave up on the "intake" BS...cause it really is a waste of time and money.


However, on the fenders depending on the location of said rust you might consider something like MCE's fenders...(Modern Classic Enterprises)

you need to seal off the rust (with POR-15 or equivalent) if you plan on bondo and such, as if you don't the rust will continue under your "repairs" and then it will end up falling to pieces.

Best of luck, and have fun.
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Old 01-17-2011, 10:22 AM   #11
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I believe he's referring to the horn that is in a YJs air intake. Sounds like that's the restrictor you're talking about.
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Old 01-17-2011, 07:32 PM   #12
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I modified my air intake tube and put a K&N type filter and pre-filter on the shortened intake tube. I didn't make this mod for performance and I didn't see any improvement. I was making room for an under hood air tank that mounted on the passenger side inner fender.
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Old 03-28-2013, 12:12 PM   #13
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@rk maxxus

I am considering doing something similar, because I really need another spot for a tool box (replace old air filter box). How does the K&N + pre-filter work out for you?
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Old 03-28-2013, 12:15 PM   #14
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How does the K&N + pre-filter work out for you?
Having stupidly once run a K&N air filter where I was forced to add one, then another, pre-filter so it would actually filter the dirt out, I'd say use something besides a K&N. I'll never run another K&N anywhere where the air is not pristine & dust-free.
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Old 03-28-2013, 12:54 PM   #15
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Being stuck with the k&n set up by PO what suggestions would y'all have for me? I bought the cleaning/recharge kit and have done that maintenance. What intervals would you suggest I use on performing that? If I could swap with someone wanting this set up back to stock I would. The roaring or sucking sound is about to get old.
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Old 03-28-2013, 12:57 PM   #16
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If I could swap with someone wanting this set up back to stock I would. The roaring or sucking sound is about to get old.
There are plenty of kids who would love to trade their OE filter & filter box for your K&N, I'd post up in your local Craigslist and/or the local Jeep forum classified sections.
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Old 03-28-2013, 01:28 PM   #17
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Agreed. There is no real benefit to running the K&N filter, despite the graphs they show in the ads for them. The posted improvements are not something you can really "feel" in the seat of your pants when driving. You would experience lots of additional noise. And possibly decreased actual performance and fuel mileage. Save for something really nice that will make a difference. Keep your maintenance up to date, as someone else said here, and you will be happier in the long run.
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Old 03-28-2013, 02:38 PM   #18
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Agreed. There is no real benefit to running the K&N filter, despite the graphs they show in the ads for them. The posted improvements are not something you can really "feel" in the seat of your pants when driving.
The gains those charts indicate are only valid for vehicles with restrictive air intakes. And there are various cars out there whose air intakes are very restrictive. However, the TJ's air intake was specifically designed to be non-restrictive so there will be no performance gains with K&N's product where a Wrangler TJ is concerned.
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Old 03-28-2013, 10:20 PM   #19
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Really, as hard as this may be to believe, there is no free or inexpensive air intake modification that will help your TJ's performance. Really. Unlike some cars whose air intakes truly are restrictive, many of which were designed to be restrictive, the TJ's is not restrictive... not in the least. It was specifically designed to be completely free breathing so no mod is going to improve upon that. Reall.
Jerry is dead right and also you run slight risk of engine not being as protected from foreign particles entering engine via these after market breathers...save you money and buy...decent brakes for example
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Old 03-28-2013, 10:21 PM   #20
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So the air intake mod is a big joke. I understand. I think I'll just save my pennies and do easy work. Maybe eventually a nice bumper with fog lights. Right now I have to fix the front fenders. Typical rust but I'm thinking about bondo and then having a friend diamond plate
Great call...well done!
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Old 03-28-2013, 10:50 PM   #21
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There is a reason every off road race team runs uni or k&n it's the oil on the filter that keeps the small particles from getting threw to your engine stock paper filters are crap especially if your in dusty or sandy conditions.
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Old 03-28-2013, 10:54 PM   #22
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stock paper filters are crap especially if your in dusty or sandy conditions.
Um, no. False. Wrong.
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Old 03-28-2013, 11:05 PM   #23
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I've been reading that there is a way to get better air intake by removing some restrictor. Can someone show me how to do this? My TJ is my highschool Daily Driver and this seems like a cool free mod. Please give me some instructions/pictures. Thanks a lot
Sounds to me like you're referring to the "horn". It's on the front of the air filter box, just twists off, if that's what you're looking to do. I removed mine, no idea if it made a difference or not, just read on here, due to the diameter of the horn, versus without, you get slightly better air flow.

Honestly though, like all have said above, not at all necessary. I'm just too lazy to put it back on.
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Old 03-28-2013, 11:06 PM   #24
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You show me one team at the baja 1000 running a fram paper filter.
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Old 03-28-2013, 11:10 PM   #25
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You show me one Baja 1000 team that doesn't rebuild their engine after every race.
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Old 03-28-2013, 11:13 PM   #26
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Old 03-28-2013, 11:14 PM   #27
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Old 03-28-2013, 11:17 PM   #28
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That's fine you keep running your paper filter but let people give opinions on what they think might be better or not better what made you the end all be all I can sure tell you not one person I know will run a paper filter in their Ls7 motor in the dunes and they don't rebuild every year there is a reason anyone who knows anything about offroad vehicles run oiled filters.
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Old 03-28-2013, 11:21 PM   #29
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You probably run Rancho shocks too because they have a cool adjustable knob on them.
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Old 03-28-2013, 11:23 PM   #30
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"But JP magazine did dyno tests to show the gains you can get with CAIs!!"


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