Just so that guy can see the 400 air filter differences. I actually had guys complain about the glued in filters of RB coming apart. I would get the removal uni filter with cage if you compare.
https://eganperformancesaws.com/products/copy-of-air-filter-kit-stihl-362-400
https://redbeardsaws.com/products/stihl-ms261-291-311-362-391-air-cleaner-system
https://eganperformancesaws.com/products/copy-of-air-filter-kit-stihl-362-400
https://redbeardsaws.com/products/stihl-ms261-291-311-362-391-air-cleaner-system