Anyone ever re-wired an EOM radio?

Have a 1998 Sunfire that came with the top-of-the-line EOM radio (CD with 7 band EQ and steering wheels controls).  I'd like to add amps to my system, but prferer not to replace this factory head.

Obviously, I could use line level converters to connect the factory level speaker outs to aftermarket amps, but I've heard that the process of changing the amp level to line level degregates signal quality.   So here's my question:

Has anyone here ever opened up a factory radio, found the pre-amp section in it and re-wired the radio so the pre-amp output goes not to the internal factory amp but out to aftermarket amps?  I'm comparatively good with electronics, so if I could get a diagram of the wiring of the GM radio, I could probably do this (even if it involves changing stuff on boards).  I'm just curious to know if anyone else has tried this, and if so, any issues they ran into and in particular where they got wiring diagrams.   Also, I realize that doing this might "mess" up the balance and fade controls onthe factory radio (if they aren't part of the pre-amp section), but I'll cross that bridge when I get to it.

Hey Mikeymars;

I have seen a guy up here ( not from this area ) that went into this OEM CD player ( 1999 Acura ) and took the signal right from the laser pick up and went fiber optics to the processor. This involved quite the knowledge of internal workings of the CD laser and it's functions ( not for the weak stomach ) and he has a total OEM looking player ( full points in the comp circuit ) and it's also CD quality with no loss in quality straight to the processor.  Here are some pictures from his IASCA Acura EL http://www.damnloud.com/acura/deck.html you can email him if you wish, his name is Wade ( wade@damnloud.com )