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It really depends on the car, but since you said CAI, I would go for it. If it replaces the stock airbox, and moves the filter to a new location where it is picking up cooler air, that is what you want.
I wouldn't expect too much of a gain, but it might help throttle response some. I know the 4th gen Camaro's can gain a good 5+ rwh with an airlid, and k&n. Not enough to notice, but the little stuff can add up.
Just make sure not to over oil the filter when the time comes. Excess oil can foul MAF sensors.
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