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i made a hole where the bottom of the air box was.

I do not have fog lights. I used the opening.

I hope I understand your question. The silver colored dryer vent material runs down to the vicinity where the hole is for the factory fog lights. this is where the bulk of the cooler air comes in.

For what it's worth. There are 5 XJ's in the family. My wife's 01 gets the best mileage I believe because her jeep has the best homemade cold air intake. All the jeeps have the same tires,exhaust...