You might check Soundgate or Metra for adapters and wiring harnesses I know they had an IR for the steering wheel but they might have a wired version that would be better.
I use to have the Bose system and that was the first thing to go it just sucked, I went with everything Alpine...HU, amps, sub and new front and rear speakers it does sound good but I also had to rewire the entire system due to the fact that it was Bose w/OnStar.
Do you have OnStar? If you do they do have adapters for that.
If you do the work yourself I'm sure you could put a killer system in your car.
Some music sounds really good and some stuff doesn't I guess it just depends on the recording and quality of what you are playing.
