Its a little tricky on the VX, cause its hard to get to. My brother claims he can do it without removing the fuel line, etc., but you need 2 people. One to hold stuff out of the way, and another to open the box and slide out the filter. The "correct" service manual way to do it says to disconnect the fuel hose, the air intake hose, and the oil separator breather hose first then take the air filter box apart to get to the filter. Here are the pages from the service manual:
Keep in mind that there is rarely a need to replace this filter, unless it has become contaminated with oil, water, etc.. Some guys run without a filter, and report no problems. You might want to consider using a R&D filter instead of the OEM filter if you do need a replacement:
ISLAND RACING