hehe...good deal. looks like nopi must have mixed up your order with the piping alone and the pipe/filter package.
just use your existing k&n filter. the one that came with the APC package is probably crap. just sell it or donate it to a honda owner. make sure the connector hose are 3 inch in diameter all the way through and the hose clamps are 3 1/2 or larger. if they're smaller, then they won't fit on your mkiv na.