Do we know for certain whether or not the activated carbon filters advertised as part of the premium package are: 1 - Not present in the non-premium package cars. I know the HEPA filter is not present but is there no carbon in the cabin air filter? 2 - Are the carbon filters simply additional layers of filtration on top of the HEPA filter - and thus if you can get someone to sell you the HEPA filter and you put it yourself in the filter location (as seen on the thread "HEPA filters for everyone") you are ALSO getting the carbon filters, because they are simply additional layers? Or are they in a different physical location, buried back in the duct system somewhere out of site? The only reason I personally will spend $3,500 on the premium package is for the HEPA system - and now that it seems we've learned that all post-refresh Teslas have the mounting location for the HEPA filter I'd rather skip the package on my next Tesla if possible. As for health benefits let's try to keep this thread focused - there are other discussions about it. What convinced me was reading that researchers estimate up to 50% of the typical person's exposure to air pollution comes from simply driving an hour a day because the concentration of pollutants is so much higher when driving behind ICE cars on the highway.