the box there talking about is not an air filter box.... i guess you need a picture to actully see what there talking about, i will get one and post it up from one of the links in a minute
**edit** heres pics
http://i4.photobucket.com/albums/y12...ivicairbox.jpg
http://i4.photobucket.com/albums/y12...vicairbox2.jpg
as you can see there not talking about a air filter box its a box that mounts to the carb very well with very little modification, theres other ways to do it but this is one of the easyest ways to get a cold air setup for a carb