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Discussion Starter #1
searched and found one old thread briefly mentioning this so i figured ide title this to be found easier.

In my 2.5's airbox there was a restrictor from the factory. removed it and revs easier and drives with a bit more power. If you are curious to see if you gain some free power try removing top of air filter housing and look in airbox outlet where hose to throttlebody connects to. there are two push tabs which will release the restrictor but i needed plyers to remove because it was real tight because there are orings holding it in.
good free mod
 

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Pushy, Loudmouthed, and Ballsy
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I did it on my yj, but I also installed a 4.0 throttle body on the 2.5 at the same time, so I'm not sure how much just the restrictor being taken out helped. I knew that I was going to feed some more air into the new tb, though.
 

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Discussion Starter #4
yeah, i already have the 4.0 throttle body and freeer exhaust but even still felt a difference and heard a difference in the engines ability to rev under load.

stock barely would do 70 mph, currently can cruise all day long at 75-85 with ease nothing else done to my 2.5.
 

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Genius
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I remember doing it when I had the 4.0L in my jeep and I remember picking up a slight gain on my butt dyno.
 

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^^^same, either it's not there or im reading somthing wrong...
 

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Genius
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It is a horn shaped device that is inside the piping for the air intake. It is black plastic like the rest of the intake. For me it was a PITA to get out.
 

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then mine must be out because i took it off the top of the airbox off at the airbox, and at the throttle body and looked straight down the hose and there was nothing in there...
 

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Genius
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Is it the same diameter all the way through? The first few times I looked I couldn't tell because it looks like part of the intake. I can't remember on which side of the airbox it was on either so you might want to check both sides.
 

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ya i checked tht out and he has a different box then me... i dont think mines aftermartket it looks stock but were the horn is on those pics i have what looks like a flat not a horn... and there's nowere it can be hiding, i guess i just dont have one...
 

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Genius
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I guess not. That setup in the writeup didn't look quite like the one that used to be on my Jeep either. Dunno.
 

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Just did this on my 2.5L. It took about 10 minutes. You pretty much only need a flat head screw driver. Make sure you take the box out of the jeep, it makes it way easier to work on. After taking it out, I sat there reving my engine and it does make more noise. Nothing worth worrying about, unless that bothers you. My jeep is already noisy to begin with, but if this is going to give me a little better gas mileage then it's worth it to me.

Good luck!
 
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