The proverbial problem...upgrading your G20 soundsystem. I just picked up a 2002 G20. gdalton gave me some great advice on installing an Infinity Basslink sub (thanks!) but I'm wondering if the stock head unit can be used as preamp-only, hooked up to a regular amp(s), and used to power new speakers that would fit in the doors and the rear deck. I've read tons about Bose systems being completely incompatible with most aftermarket stuff. But, ultimately, can the original headunit be kept and the rest of the speakers/amps upgraded? My last car had Kappas all the way around with a 4x75 watt amp hooked to preamp converters(?) on the original headunit. I miss the clarity and taut bass. But, I live in a high-theft area, and the slightest indication of custom stereo equipment in a car gets it broken into within a week, so I like keeping the factory headunit and upgrading everything else in stealth. Any suggestions?