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So I've been researching this for a while, things just aren't adding up, and I'm not sure why. My as-built data does not show values that other people have shown, maybe they had older models? Different speaker configurations? Here's what I'm trying to do, I want to amplify my speakers with an...

Say one purchases a base model of any engine size and gets the basic audio system. Is it possible to upgrade that with the Shaker Pro Audio system from the Mustang premium trims? Does Ford Motor Company or Ford dealerships offer that Shaker audio upgrade after vehicle purchase?