Re: hooking up
as Panda said, best place for power wire is through a rubber lug that is situated basically right in front of you in the firewall, access this from inside the engine bay.
secondly, its either you want good sound or bad sound, if you want good sound, get a new headunit that has some decent equalizations, and if still not happy, some new speakers. if you have a BA, im sure $800 for a decent h/u and 2 sets of nice speakers wont hurt that much.
thirdly, why do you want to hook up an amp? not to run factory speakers i would hope...
Soon to come: Full engine rebuild, Race pistons, Performance cam, Full Defillipo Performance Exhaust