2017 Base interior upgrades

[tiptone]

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 speakers that I currently don't have? The factory base sound system is by FAR my least favorite thing about this car, with the tiny screen coming a distant second.

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[WildHorse]

Base 300a already has the best interior .

 

[tiptone]

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

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