Hi All I would like some first hand experience. I have a 420R, 6 speed, LSD (BMW, Titan). I am thoroughly fed up with the racket the diff makes. With the windscreen in place rather than aero, it is a dominant noise in the car and does ruin the drive. Whining, banging and the overrun noise is shocking. I had an SLR with LSD before the 420R and it was silent... No diff issues at all in 30K miles. I used to track and Sprint that car. So, I am interested in some first hand feedback from anyone who has changed to Tracsport Ultra Sierra 7'' LSD. Is it any good? Quiet? Have a reasonable life span? If not the Tracsport, then maybe another alternative. But I need to get this upgraded ASAP. The Tracsport does seem good value if it does what it says on the tin. Thanks