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Unread 02-02-2012, 10:08 PM   #1
JTM45
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Cold Air Intake XJ

So I got a friend with an '01 Saturn L300 V6 and he's got a cone air filter on it, and the thing is so loud, when he's in front of me I can hear him from inside my jeep with the music on, everything else is stock. Without the cone it sounds like a normal car btw.

So ya know, I want my heep to be loud too, so I spent a lot of time researching and people say it makes a difference, people say it does nothing. I had a 6x7 airaid filter cone and it made a different sound at higher rpms, and pulled just A LITTLE harder, but otherwise didn't do much but kill gas mileage. my Jeep is a 2000 XJ 4.0L

Took that same filter out of my jeep and stuck it in my friend's jeep who has the 4.0L in a 98 ZJ, thing sounded like a friggin mustang coming down the road, and he let me drive it and it accelerated like a mother compared to its acceleration with the stock airbox.

So now I'm finally getting to the point. Perhaps the reason for the varied responses on whether or not a bigger filter actually does anything, has to do with what year the jeep is, because I know somewhere along the way they've made changes to the 4.0L I6. Maybe someone has figured this out already but I haven't come across this reasoning yet and I've read so many posts.

Now my Saturn friend says that perhaps why the filter does really well on the '98 4.0 and not my '00 4.0 may be because the timing for the intake and exhaust is different between them? something like that? I'd like to understand so whoever is still reading by now thank you for any information you give!

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Unread 02-03-2012, 07:51 AM   #2
Azzy
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Probably because on a Saturn, there is a resonator chamber that connects to the stock intake, that muffles those loud noises

I would read up on here: http://jeep-xj.info/HowtoAirFilter.htm

And note, most of those cone filters are not filtering as much, thus letting dust and dirt into the intake...
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Unread 02-03-2012, 07:55 AM   #3
theshaolin
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Unread 02-03-2012, 08:45 AM   #4
rsurran
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If you want a Mustang, IMO, buy one. I have both as do other members on the forum and I know my Jeep is not built for that kind of performance. When I upgraded the Mustang to CAI, Cat back, and performance (plus hi-test gas) tune there was a noticable difference in both sound and acceleration. CAI alone doesn't do much. Buy other stuff for your Jeep don't waste money on CAI and welcome.
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Unread 02-03-2012, 09:00 AM   #5
alexrule123
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The only difference between the '98 and '00 are that the '00 has much smaller exhaust ports and a distributor less ignition.

You can see the "performance" upgrades I have done in my signature and all of those have made a noticeable difference.
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Unread 02-03-2012, 11:28 AM   #6
Barbdaman
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Something about being under the impression that a cold air intake on a certain xj was pointless due to an intake sensor?

Maybe it was my model, just seemed like the appropriate place to bring this up.
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Unread 02-04-2012, 08:58 AM   #7
JTM45
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Yeah I gave up trying to improve my jeep with intake mods, was looking to injector upgrade :| but I was confused as to why it had such a great effect on the ZJ like it did with the saturn, why not my XJ?
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Unread 06-17-2013, 04:52 PM   #8
DZINE
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Quote:
Originally Posted by rsurran View Post
If you want a Mustang, IMO, buy one. I have both as do other members on the forum and I know my Jeep is not built for that kind of performance. When I upgraded the Mustang to CAI, Cat back, and performance (plus hi-test gas) tune there was a noticable difference in both sound and acceleration. CAI alone doesn't do much. Buy other stuff for your Jeep don't waste money on CAI and welcome.
i agree 100% cramming more air into your engine isnt gunna do much when its trying to push all that air through a stock exhaust. THINK ABOUT IT ( more air in = incresed exhaust backpressure)
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Unread 06-17-2013, 05:16 PM   #9
biffgnar
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Quote:
Originally Posted by DZINE View Post
i agree 100% cramming more air into your engine isnt gunna do much when its trying to push all that air through a stock exhaust. THINK ABOUT IT ( more air in = incresed exhaust backpressure)
Is necro posting multiple threads on the same topic really necessary?
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Unread 06-17-2013, 06:52 PM   #10
mschi772
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Probably trying to pad post count.
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