one major problem with the speaker install is that the trunk springs get in the way. some people have problems with the mounting depth of their 6 X 9's ... i'm not too sure how big the magnet is on the kappa's, but it's something to consider. same thing with the front doors, there isn't much room to work with.

if you're getting components up front, you'll be getting a really clean high. if you're not planning on getting a sub, go for the 2 ways in the back to even out the highs and lows. (i've been in a car with all 3 ways, and no sub ... the sound was clean, but there was no punch)