I think the "Performance" sticker is a advertising sticker that came with the packageing of a after market airfilter for intake, and whoever put the filter in, put the sticker in the intake housing. Also the "Stop" sticker also on the housing, is a EPA requirement sticker that was also in the filter packageing. It is because there might be some oil residue on the filter when replacing, so EPA does not want you to trash in land fills. I would remove both.
Bob