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I have the 1SS 1LE. The best way to upgrade the audio system is using the PAC audio or NAVTV module. The module intercepts the audio signal at the radio tuner module behind the glovebox. And gives clean and flat RCA outputs. Not only that, you can independently adjust the door chime/turn signal chime level.
This is the best way to upgrade the audio system for the 16-18. The 19+ uses a different type of system from what I’ve read on here.
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