From our friends at EVTuning, we present their awesome Model 3 & Y HEPA Filters! We found these while searching for a solution to replace our stinky filters, that after the summer were starting to smell musty with a hint of vinegar.
Made as a perfect replacement for the factory filters (p/n 1107681-00-A), these add 3M HEPA filter media and activated carbon to keep the air inside your Model 3/Y beautifully clean. Please refer to the video below from TeslaRaj for replacement instructions (jump to 8m 30s for the installation).
The project is moderately easy, but does require the removal of a trim piece, and the location of the cabin filters is awkward, and made more frustrating than it should be by a poorly placed retaining screw. After they're installed, there's no noticeable change in air flow or load on the AC motor.
The science bit: These filters cannot instantly remove all odors and smells from outside. By way of comparison, the factory filter, at best, catches particles down to ~10 microns, and is classified as a Conventional Particle Filtration membrane. It cannot take odors out of the air, and that's why all cars have a re-circulation feature, to prevent heavy odors and particulates entering the cabin (and to reduce the AC burden on hot days). These filters are 0.3 microns, and are rated as a Micro-filtration membrane. This will catch some bacteria, and most airborne pollen, spores and smoke, but also will not prevent most heavy odors. This is why S & X, when the bio-weapon mode is enabled, immediately switch to re-circulation mode, as the same air is scrubbed repeatedly by the filters.
Again, please watch the video, but these are the basic steps: