Standard sound upgrade Bose

[pacificaffe]

I have a 4s, I didn't order Bose sounds during configuration.
Can it be installed in the service retrospectively?

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[oalsaker]

Best plan is to go to your local custom stereo shop and see what they'll do. It's pretty much all up to how much you want to spend.

This is what someone said in the thread I posted with a similar-ish question.