"K&N makes wonderful stuff, but I found out the other day that the oil filter for the Imprezas (HP2008 I believe) didn't fit my MY00 RS... yes, it starts to screw on, gets through about two threads, and then stops. Anyone else have this problem, or did the book have a serious typo?"
When I spoke with K&N Engineering, they gave me the part number HP-1004. I have ordered this filter for my car, but do not have it on the car yet, so I cannot comment, but it appears you may have the wrong Filter....
~Scott
Rally Blue MY99
Owings Mills, Md.