Tesla Owners Silicon Valley asked Elon Musk on Twitter if a retrofit would be possible for older vehicles that don’t have the speaker. This was his response: Ok, service might be able to do this. Will check. — Elon Musk (@elonmusk) December 27, 2020 Ok, service might be able to do this. Will check. December 27, 2020 Some vehicles appear to have the wiring harness for the speaker and there are others that have the holes for where the speaker would go, but no speaker. Simply adding a speaker to the existing wiring harness likely wouldn’t be enough. Tesla would more than likely have to push out the software update that specifically includes the Boombox. When I had our previous 2018 Model X upgraded with the HEPA Air Filter, the Service Center installed it, but failed to make sure Biodefense was enabled. I ended up having to call support to get this taken care of – it would likely be the same with an external speaker retrofit where someone at Tesla, whether the SC or support line enables it.