Bose car audio is all hype - nothing more special in these speakers or components than in any mid-00's and up car. The engineering comes in where the crossover points are set internally in the amp, and the time spent in tuning each stereo to each model - working out cancellation, phasing, etc. Bose makes some pretty great stuff, but honestly it's a LOT about the marketing.
The funny thing about GM is that the Bose systems have odd impedances (relatively speaking), which makes plug-n-play difficult. If you wanted to just replace the speakers, you could - but you still need a crossover (comes with virtually any component set) and you'd actually lose volume, depending on the speaker. To the best of my knowledge these midranges are 2 ohm, and virtually ALL component sets (with a few exceptions) are 4 ohm - so you'd need something with a sensitivity higher than probably 91 or 92 db just to have the same volume. The sound quality would be much better, even with cheapo aftermarket speakers.
We need more info - what's your budget, what's your goal?
Also, unrelated to topic, I grew up in Pineville. From birth till about 12 years old, so 80's timeframe. Haven't been back in 20 years, but yeah... My old stomping grounds. Lived on Morrow Ave.