I have heard the rumors of eroding impellers from the water/meth but I have seen no evidence from anybody yet. I have only heard about it in the context of theory and not as fact. I am not saying that it is not possible, but I would love to hear from somebody with specific experience of damage to a blower from meth injection (sprayed into the inlet). Again, I am not stating that I have proof yet that it does not damage the impeller over extended use but I also have seen no evidence to the contrary. Somebody please post the info you are reading that shows some proof of this erosion if it exists. I dont want to lead people to a destructive upgrade, but I also dont want to see people scared away from a inexpensive way to increase engine safety and power.