Anyone know how to add a sub to non B&O 2025 Mustang without tearing everything apart

[disneyfun1]

Just traded in my 2024 Mustang for a 2025, guess i didnt pay attention that the top 201a-401a package now does not include the B&O system like it always has, found out after that is now a stand alone option. Is there a quick and easy way to add a sub to this system without tearing everything apart? Would i need to go with a powered sub in trunk and if so what wires would i tap into. Not looking to spend a lot on it, just something to give it a little more

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