Bioweapon Defense Filter Retrofit by Moderator 30-Jan-2017 For the Model S or X, if you didn’t purchase the Premium Upgrades Package, Tesla offers a retrofit for the Bioweapon Defense HEPA filtration system. The retrofit cost is $500 includes parts and labor and includes the needed firmware upgrade. Model S HEPA Air Filtration Upgrade Model X HEPA Air Filtration Upgrade Share 1 comment 10 Awesome Tesla Modifications & Customizations Fans Will Appreciate 5-Nov-2018 - 3:24 pm […] me one modification that sounds more intense than a Bioweapon Defense Filter. I’ll wait. Think of anything and unless you know how to outfit a Tesla with fully functional […] Log in to Reply Leave a Comment Cancel ReplyYou must be logged in to post a comment.