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Old 07-08-2014, 11:36 PM   #1
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Thinking about to get air intake. Need suggestions.

I have an 03 tj. It is 4.0L I6. I recently thinking about get an air intake system. because some one told me it will provide more power especially in low gear. My jeep is lifted 2inch with 31 tire on it. So it make the jeep little weak on 5th gear especially on highway. So I wondering if the air intake will provide the additional power to make the jeep more powerful. And does the bypass valve and throttle power spacer also recommended with the aftermarket air intake? Also please give me some suggestions that which model or brand I should buy? Thanks a lot!!!!

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Old 07-08-2014, 11:50 PM   #2
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Dont. I took out the "cold" air intake that the previous owner installed and I re-installed an OEM air intake.

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Old 07-09-2014, 12:04 AM   #3
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Don't waste your $$$ on it, the TJ's air intake is totally free breathing and not restricting air flow to the engine in the slightest.
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Old 07-09-2014, 12:25 AM   #4
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Is there another way that could let the jeep regain the lost power caused by oversize tire?
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Old 07-09-2014, 12:36 AM   #5
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Regearing both axles to a lower ratio is the correct and only viable way to restore the power lost by having installed larger diameter tires and it works extremely well. I have regeared twice as my tire sizes went up from 30 to 33 to my current 35" tire size. It's not cheap but it works and is not a waste of money like air intakes etc. are.
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Old 07-09-2014, 12:39 AM   #6
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Is there another way that could let the jeep regain the lost power caused by oversize tire?


Turbo, bigger engine, supercharger.... Once you do what we do to a Jeep you turned it into the opposite of a sports car. Jeeps are made for specific things which means you are going to sacrifice in some areas. But I'll take it any day of week.
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Old 07-09-2014, 12:45 AM   #7
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Turbos, bigger engines, etc. are only a band-aid fix when the real issue is a mismatch between the tire size and effective drivetrain ratio. Correcting the ratio mismatch by regearing the axles is the cure for the root cause issue.
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Old 07-09-2014, 01:42 AM   #8
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thanks for advice. One of my local shop quote me around 1300 to get the gear ratio fixed. I don't know if that is over priced or it just how much it cost.
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Old 07-09-2014, 08:14 AM   #9
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thanks for advice. One of my local shop quote me around 1300 to get the gear ratio fixed. I don't know if that is over priced or it just how much it cost.
if that includes all parts & labor for front and rear axles, that's a pretty reasonable price.

what axles do you have? what is the largest tire size you expect to go to? have you checked to see what your current gear ratio is?
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Old 07-09-2014, 09:30 AM   #10
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if that includes all parts & labor for front and rear axles, that's a pretty reasonable price.
x2. There's a lot of labor and expertise involved and required for that particular job so that's a very reasonable price. I've seen some people positing where they were quoted $1800 to do the same job.
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Old 07-09-2014, 10:28 AM   #11
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if that includes all parts & labor for front and rear axles, that's a pretty reasonable price.

what axles do you have? what is the largest tire size you expect to go to? have you checked to see what your current gear ratio is?
Everything on my jeep are factory expect I have a 2 inch lift. Right I think 32 inch tire is the largest I will go. But i am not sure after one or two years if I decide to lift my jeep again and get a larger tire, then I may need spend the money again for gear ratio.

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