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All the cars I'm looking at have the bose surround badges on the doors but some of them say they have it as an extra. I'm confused

Good morning. I'm currently in the market for a q7 (2014/5 model) but getting somewhat confused with factory extras. Some say that the bose surround is an extra option. My question is does that mean the extra from factory has better speakers? I have a good amount of questions to ask however I will stick with just 1 for now Any help greatly appreciated