If anyone is parting out a late model, Model S, I am looking to upgrade my Model S to add the HEPA filtration system. My understanding is that this upgrade is possible.
You can buy the upgrade for $500 on the website and includes configuration. Just adding the filer will not enable the biohazard feature. Filter by itself is like $300. The configuration change will have to be performed by Tesla, and they will not do it unless you bought the $500 upgrade through the website.