Bose blows. You're going to spend a pant load to "fix" it, and it will still sound like crap. The only real way to "fix" a Bose is to totally replace it. Go with a double din (just means twice the height) head unit, and the sky's the limit. They're available with pop up screens for GPS, Sat Nav., Blu Tooth for cell phone, and i-pod connections. Or, just AM/FM CD with or without cassette. No 8-Track though. I went with a new head unit and all four speakers. WOW. I didn't do the 10 megawatt amps or the giant subs. I'm trying to preserve what little hearing I have left. You'll need to remove a seat and peal back some carpet for wiring. But, the whole run from dash to rear speakers is only like what, six feet? Big deal. Brands? Up to you. Stick with known top brands for reliability, quality, warranty etc. (Except Bose). Your ears can't tell the difference.
Fixing a Bose is like bragging that Chip Foose totally restored your Yugo.
Fixing a Bose is like bragging that Chip Foose totally restored your Yugo.