Mine still makes noise. I had the shop that installed it open it back up, replace the bearings and check the pattern on the gears. It looked perfect to them but they adjusted it with the assortment of clips I bought to make me happy. Then I filled it with Motul 75 140 with no change in the singing. Mine makes the most noise at around 60mph. If street driving was my primary usage of the car I'd yank it out and sell it. For racing it's spectacular even with the opera of sounds from back there.

Les