I ran the Apex event last Saturday and by the end of the day there was a very loud howling that persisted mostly at speeds from 50 to 60 MPH all the way home. This is the first event that I ran NT01's. I changed back to the Star Specs this evening and took the car out for a spin to see if i could determine where the sound was coming from. No howling and the car ran normal. Are the NT01's known for the howling sound?