I take it you bought this new? If so, I would call them. Maybe you got an old one, I mean a real old one. This is from there catalog...
Note: pipes are redesigned (as of 9/01) with a larger port for the ACT sensor which puts the sensor in the air stream and simplifies installation.
As for the MAF Adaptor, I had no problems with mine so I have no idea. I am not sure why you cannot remove the 4 bolts from the stock MAF, but... just call them and see what they can work out for ya.
