Swapping X's for Trick Flows
Weather, humidity.... really screw the air quality. Flow benches for instance... they flow air not water... air gets too humid...numbers get funky, the humid air doesnt hold @lift sometimes.
People dont talk about this much, except on speed talk, once in a while. I quit on my x heads for a week because a port that flowed 254.... went south .. after no changes other than the weather/humidity went 75+%.