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FS: Model 3 SR+ Partial Premium Audio Upgrade DIY Harness - $65

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I have a brand new DIY wire harness that activates the 6 inactive (4 if rear speakers are missing from your SR+) speakers. I ordered this harness for my SR+, but decided to get the professional package later on after this order had already shipped. $65 shipped in USA. It will likely get to you faster than ordering from their website since it comes from an international location.