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  1. Hks mushroom filter

    2010-2013 Mazda 3 Engine and Performance
    So i searched and nothing came up so i figured i'd make a thread. A neighbor of mine has a 240sx with an hks sri with the mushroom/semi-circle filter. I personally thought it looked badass and wanted to know if anyone would happen to know the dimensions of the filter needed to fit on my CS sri...