Please anyone with this problem please contact powerslot! ASAP. And keep posted on forum. My problem in general if you read my post it is the rotor hat. I was able to make hat seat by dremeling out back of hat. This power slot is aware of but not a correct fix, the rotor is out of balance. We got junk rotors made by AEM paid good money for them, we should get what we paid for...a part to fit application w/o modification.