Our assumption is the Flex only… however… there are other threads on this forum that are exploring using a totally passive tank circuit to “boost” or really just change the shape of the field from the reader to make it easier to use implants with readers that are having a hard time… it might be possible to “stick one of these” on the side of your Tesla to enable the Max form factor.
We are exploring the actual production of such “stickers”, and hope we can make them weatherproof for outdoor applications as well.