I've done some research into the OEM replacements and I agree that it would not be a wise move...

This is my new plan -- looking for some advice/thoughts/criticism.

1. Replace the rear D-pillar trim pieces with the Hifi Trim pieces. This should be an easy swap and will allow for component speakers to mount on the rear D-pillars (exists in the premium systems). realoem quotes the trim piece around $75 if memory serves me.

2. Modify the rear door panels to house tweeters -- has anyone ever done this? The oem rear door panels are super-expensive. $1200+ for the door panels with tweeter cutouts from the Hifi setup.

3. Center speaker. There's a grill there so I would assume the mounts exist. Anyone have any information on this?

4. Amp the system. I'm an amp n00b, but I would guess I could use the 4 channels coming out of the headunit to be the signals for the amp. I've also read that it would be nice to have an amp that you can "reverse dsp" to compensate for the head-unit level adjustments. An alternative would be to recode the headunit to Hifi which does not have the signal processed (correct me if I'm wrong).

5. Replace the speakers. Since we'd be going after market on the amp the BSW kit doesn't seem to make much sense (except for fitment). If speaker fitment is an issue one thought might be to be the logic7 BSW upgrade to insure proper fitment in the doors, D-pillars and center channel.

I'd love to hear everyone's thoughts on this....