The factory radio has pretty good midbass already, but my g/f wants a system so im gettin her a cd player for her birthday. When i get the cd player installed im afraid that the bass will no longer be there...Thats what happened in one of my friends cars...
unless you get a total piece of shite or do a horrible install you should have equally, if not better, all around sound - including bass. if you're really worried, get one with a built in EQ: 99% have some form of EQ anyway...