As well is the AFE which makes the TRD CAI. But if you want the best air for the buck install a snorkle. Even with the stock filter intake you will be sucking in 2 to 4 degrees over ambient temp. I got both and love it, the TRD CAI for the filter and the sound, and the snork for colder cleaner air and deep water insurance.
Um, yeah, if I cut into the side of the FJ the wife would kill me......LOL
I already have k&n FIPK, I just liked the concept of the URD placement where it could get more direct air, as opposed to the air from inside the engine compartment. Also the K&N seems like it would be restrictive with all the bends it has vs. a straighter tube. I may go TRD for just that reason........ or maybe not.