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New in box Sync 3.4 upgrade kit for 2015-2018 Mustang from Harness by Hextall. Includes new Recaro bezel, fully functional drive modes, CarPlay, Android Auto, Google Maps, Waze, etc. I didn’t get the factory nav, Sirius XM, or the CD slot bezel. Everything is still boxed up but I’ll be happy to...

I know there's plenty of information available for the Sync 2 -> 3 and 4" -> 8" screen upgrade, but I'd also like to be able to upgrade the door panels to get the two extra speakers. Anybody know if there's additional wiring required or does the harness already include connectors for those...