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Once again i'll point out that a Cold Air Filters are sort of a misnomer as they take in hot air from the engine compartment.
They do however present better airflow which theoretically should increase engine performance but how much? And at what cost to the engine?

I installed a K&N dry high flow replacement type air filter in my XJ's OEM air filter box.
No oil needed and can be cleaned with soap and water.
I have to say it did make just a barely noticeable increase in engine performance at least in my mind. haha
Been running it for around 5 years and recently cleaned the IAC and throttle body.
Both were clean as a whistle not even needing cleaning so i'm happy with the filtering aspect of that K&N.

If you go with a CAI, i'd at least recommend one that doesn't require oil.
While the oil types can filter better they're a PITA to clean not to mention possible MAP sensor deterioration.
And if you go this route don't expect a quantum leap in HP if any leaps at all.
 

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The Jeep's OEM air box's filter housing is hopefully in the best possible location to intake cooler air.
Because of that what makes sense to me is to get a dry high flow filter that can be installed in the OEM air box.
 
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