Here you go!
It helps if you remove all 3 trim pieces, but the second time I did it, I only took out the right and middle trims.
I suppose you can DIY some sound deadening in there too, seems to be lots of empty spaces and exposed sheet metal to transmit noises
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From the even "blackness" of the filter, it didn't seem it was making any hot spots; I feared it might create uneven air flow but ended up ok. The concerning thing is that I wrapped the filter on top of the OEM filter which means the air going through should've been filtered by the OEM element already and it was still blackening up the filter. Then again this is Hong Kong....
Ideally yes 10 days would be where the activated carbon portion is saturated with pollutants but yea that would be a hassle unless someone did it for me for free LOL. But just for dust/fine particle filtration the filter would still be good for about 2 months I think. I can't imagine how the Model X's HEPA and bio defense filters would work out...