Yeah, I have Kappa 3-way 6x9s in the front doors and Kappa 6x9 2-ways in the rear.
These come with a plastic spacer (about 1/2" thick) which I put between the speaker frame and the door. Just wanted to make sure the magnets cleared the window glass. No biggie to install in the front; just drill new mounting holes.
The rear required a little bit of trimming to the metal door pull bracket to clear the speaker frame. This bracket is just screwed into the door itself and can be removed, trimmed, then re-installed. In either case, no modifications are required to the doors themselves or to the door panels.
If you do not plan to use a subwoofer, I would strongly recommend also putting 6x9s in the rear doors. I know that many people look at the rear speakers as just "fill", but in order to make bass, you have to move a lot of air. Four 6x9s will move a lot of air, but get ready to track down and fix all kinds of rattles in the doors.
BTW - Before the 6x9s, I had the Kappa 5x7 component system installed in the front doors. They were OK, good midrange and highs, but lacked good low end punch.
I left the crossover and tweeters from this component system hooked-up and just wired my 6x9s into it (bypassed the low frequency crossover though).
Expensive speakers, but well worth it.
Last thing, give these puppies plenty of power, MINIMUM 50 watts RMS per channel. They'll suck it up and ask for more.
Good luck with the install.
-Wes
98 SE Sport
