I'd have to hear it to judge, but in my experience no sound system in a car sounds as good as it does with a dedicated subwoofer. The full range speakers just can't do it all at once, at least not in the bassy genre's I listen to. The Infinity system in the 8G is pretty good, so I'd imagine it's better in a 9G, but I still think my setup shits on the Bose setup I had in the 2011 Impala LTZ rental I had a few months ago, and I really liked the loudness and clarity of that system, very powerful, lots of bass, but not close to my setup.
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