Theres no need to take off the bumper, just undo the arch liner and un screw the jublee clip thing (i guess thats what its called) and pull the filter off the pipe. Get a K&N cleaning kit, clean it and put it back in once dry.
I have just got mine(aem cai) and installed it a few days ago. realy easy to fit just take out the old airbox, take off wheel, move arch liner out of the way, get the AEM pipe in (if you put it in from
the top, the ground cable from the battery will be in the way and may need to be flexed out the way, plug all the hoses and sensor back in, put the filter on, wheel on and off you go.
I have come from a hondata modded airbox (quiet) now with the CAI the noise is awsome at vtec crossover (standard exhuaust), I also have a Mugen front bumper so their is direct air flow to the filter.
Without the Aem CAI the type r crossover is not distinguishable IMHO, get the CAI and my VTEC goes BWAHHHHHHHHHHHHH