What do you do with the little air tube the connects to the back of the factory air box that opens that flap? I have a suggestion on the cai. Since i have a home loan and not much spare coin i wanted the sound of an aftermarket cai with the look of the standard air box. What i did was cut the largest hole i could in the side of the airbox that faces the battery. The hole itself is in the base of the box and not the lid for obvious reasons. What this has done is let all of the cool intake sound out without letting too much warm air in. The difference in sound is simply amazing BUT if the cops pop the bonnet for any reason it all looks stock. The main benefit i found was a really deep induction/growling noise in the mid range and the obvious scream in the lift zone. The next plan is to run a pipe from inside the guard to within a few inches of the hole to direct cooler air to the k&n panel filter. It took about an hour and didn't cost a cent. Be under no illusion, this will NOT give you more power, just more sound.