If your carb is jetted right you will notice a nice difference with the hole in the lid.
Another option would be to buy a pro design pro-flow and install it to your airbox. You can then use a 400ex air boot and a clamp on style air filter either K& N or a foam UNI.
There are also a few options for the airbox lid. 1) no airbox lid and use a Outerwear on the filter. 2) buy a EHS Racing lid that is a modified stock lid with a outerwear on it. 3) You can use a K&N power lid (with outerwear on top).
03' Z400 -Full Ti Yoshimura TRS, FCR39, GP3 +2 stem, Elka stage 3's & link, Hermann swing arm, LSR axle, AC nerfs w/IMS healguards & pegs, DG bumper, OMF beadlocks, Maxxis I-Razars, Flexx Bars, QuadTech Shrouds
03' KFX400 - xc to mx rebuild going on here --->
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