Check out Felipe Merjech drifting his shifter kart in the rain. I just had this video shared with me, and I had to post it on StartingGrid. The angle that he carries between the corners is just awesome!
It shows you can also get away with a lot more in the rain in a kart, than you think. I wonder if he was running Vega rain tires, those have amazing grip in soaking conditions… Anyway, mucho impressive.