i guess you changed this topic.
the sound is "ok" with the bose in the g35 sedan. a friend of mine has an 04, its no mark levinson , probably not even as good as the stock TL sound system. i've got a tsx now i'd say the sedan bose is about the same as the stock tsx system. my g35 coupe had the stock system.
the coupe with the stock system, i think its all you need. the bose doesn't sound any better from what i've heard. the problem being that the rear speakers sound sort of odd no matter what because of the slope of the rear windshiled and the location of the speakers. i guess there is some bad acoustics there. its not a bad system though (well the mp3 feature is pretty crappily implemented), i personally think the bose is a big ripoff in the g35 , but you are forced to pay for the upgrade if you want the premium package (if you want nav for example you have to buy premium).