adding a amp to a 2018 GT350 question on shaker

[Darkhorse18]

is the signal wiring run to the trunk for the shaker if it wasn’t installed?
Thinking I can find the harness and tap it so I don’t have to cut the speaker wires in the trunk.
Or do they make a harness extender for the speakers so I can cut that instead?

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[Chef jpd]

https://www.mustang6g.com/forums/threads/what-to-add-factory-subwoofer-to-trunk.105567/