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This is everything needed to upgrade a base, telephone pad, stereo to a full all-Ford-parts Sync 3.4 system. Also included are the upgraded door speakers as well as the tweeters that the base system doesn't have. My plan had been to acquire the door cards from a premium before somebody smashed...

This should work in any 2015-2018 Mustang Ecoboost, GT, or GT350. The bezel is for cloth Recaro seats, so there are no non-functional seat heater buttons/switches.

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 like the look of the 300a interior but I'd like to get the extra speakers in the 400-level door cards.

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...