Well it stayed quiet until I went to a sticky track then I had some noise which didn't go away. So I went to a dealer in my area which has a super tech guy and got him to put a new set in. Was very quiet until I went to the track. Go figure. Ford replace them under warranty but they won't do it again because they know I track my car. I'm going to run 1,000 miles before I go to the track and see what happens. I just may have to install sound deadening material because I won't stop going to the track. The noise is not bad driving around home but I went for a 1,700 mile trip and had just about enough of the noise and that I is why I took it back to the dealer and got them replace under warranty. If all fails I'll buy a 9" or something.