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I have installed a mishimoto intake which iirc has a 4" filter without removing the bumper. I also have installed a number of FI intakes without removing the bumper. You can remove the T bar behind the radiator which is 2 bottom bolts, 2 top, and 2 that are tight to get tin in front of the bumper (accessible via a wrench) and then you can tug the bumper slightly and get just about anything in there.
So basically any of the intakes work. Personally I don't like the injen intake as it has a lot of turbulence. Grimmspeed, mishimoto, and perrin have the least turbulence in the order i typed listed.
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