"Also, do you think I'll see substantial gains in sound by replacing my
head unit with a nakamichi cd 400 (I've already decided to do this
or not it improves sound since it's the only decent looking head unit
has in dash CD), replacing the front speakers with alpine sps-080a's (I
I could go to 4x6, but I'm lazy and crutchfield makes this very easy
front) and kenwood kfc-x468c's in the back? And doing nothing else
than maybe, and that's a very weak maybe, wiring).
The one thing that is for sure is that speakers are going to make a
bigger difference in how good it sounds than the head unit. That's
true for any stereo system and even more so for a car, where speaker
size and space are limited. I'd spend the most time researching what
speakers are available that can be worked into the spaces available.
Another consideration is adding a sub woofer, which can make a dramatic
difference in bass, provided you have a place to put it.