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Got my air set up from fuel moto also. They use a K&N filter and mine was also a purple color. After a bit of ridding and a cleaning it is no longer purple.
I found that the color (red, purple, pink, blue) only lasts a few days and they turn dark and look gray or black.
This is what the red oiled filter looks like when the color fades. (my old 05 Super Glide)
That is my experience too.. I've been running K&N filters in different applications for years and the "red" only stays visible for a week or so.. It color is there to help you when you're oiling it.. You can see what area has been covered.
