Yes a drop in with holes will get more air in there and with jetting usually adds a little. A clamp on the carb will give the most. I am going to put a clamp on in the airbox . Going to get an aluminum tube to clamp into the airbox tube, then clamp the filter to the aluminum tube. Also going to put as many of the one inch uni filter vents I can fit in the lid and 2 in the back of the box. This is the only way you could run no lid since the drop in filter is held in by the lid. My son likes to run through mud/water so can't do a clamp on on the carb or no lid.
05 YFZ450- in boxes-Summer08-maybe fall 08-maybe winter... Summer 09 for sure-maybe
03 Blaster- too much to list.
08 LE Outlaw 90 - Max RPM pipe/CDI Tag/Powermadd Soon to have big bore w/race head. Haulin Donkey Racing PeeWee Pro OXC #630
00 PW50