I just got a new HU (Premier DEH-P940MP) and want to upgrade the speakers. I like the sound of the Infinity Kappa's but I'm not sure what'll fit... I think I can fit their 6 1/2" (60.5cs) in the front but I don't have a clue as to what will fit in back.
I've got an '03 wrx wagon with the premium sound upgrade...(it sucks, but it would've cost extra to remove) Any suggestions/links that anyone can recommend?

 

6.5 will fit in the front doors fine (w/adapter). 5.25 coax's will not fit in the rear doors without modifications. if you want a 5.25 in the back, i would get the component set or just go with the 4".
DF