i think unless its done properly it wont be as affective as the CAI i know that the standard box isnt that great for air flow also they have a little plate inside the box that opens when in lift, you want somehting thats 100% open t all times not just MOST the time i WAS going to get a HSV or FPV box installed, AIR RAM it and K&N filter i was also gonna relocate the battery to the boot but it turned out to be too expensive, but personally i reckon i would have got BIGGER results from that then the CAI but oh well. Too late now ahaha