I had to ask the customer "any idea what the red thick fluid might be in the bottom of your air box ???" I had no idea. However, when he said "it's probably from my K & M air filter," it was like dahhh !!! However, I've removed many of those air filters, but have never seen any red fluid under one. He also had about 3" of red fluid in the bottom of his breather tube.
In the picture shown, and before I share what it is, can anyone spot the obvious error this customer made, and most others make when installing a K & M air filter ??? Hint ... it has nothing to do with the red fluid.