I noticed that the cover for my air filter has a sticker on it about not throwing away the enclosed K&N "non-disposable" air filter. I haven't touched the air filter; it's as it was from the dealership.
Did I buy a modded WRX, or did I just miss the part where Subaru got some sense about the air filter? It's a 2003 wagon, and I bought it used (so pre-mod is possible).
(edit: ok, so "modded" in this case could just mean the air filter. maybe)