I'm a bit confused so could someone please explain to me how this works exactly? We all know our 3rd gens didn't come with an in-cabin air filter, did some Russian Surf models come with one, or did some guy in Russia design and make this? Are the mount and filter separate pieces? Can just the filter be replaced, if so is it an off-the-shelf filter or will it need to be custom ordered from Russia? Is the filter washable? Where does this get installed exactly? Would installing one require me to make permanent modifications to my air vents? How effective is it? How noisy/noticeable is it? How hard would it be to remove/reinstall it should it need servicing?

Thanks.