Anyone know if there would be any problem using an aftermarket amp with the factory speakers?

Kindof defeats the purpose of adding a 3rd party amp...Personally I would add speakers as well...most factory speakers are not up to the task of handling any more power than what the OEM setup will throw at it....even though the bose lux stuff does sound pretty good...
I just upgraded from a tahoe with a full j/l audio and alpine system (not the cheap stuff either 300/4 500/1 10w7), im selling the gear as I feel the factory stuff is that decent