Plates were not carbon and according to R&R were in perfect condition - just my Belleville springs needed replacing - R&R say my rebuilt Titan LSD is as good as new! Will probably be trying to sell it soon! My Titan LSD had always been quiet (I started with an open diff and had the LSD fitted after about 5 years of ownership so I could do donuts giving joy rides at the Children's Trust Super Car event! - did not notice any significant noise change when the LSD went in) so when I started to hear loud clonking noises when turning at low speed I knew something had changed. Do not really understand why there should be any noise difference between different plates types (be good to have some wisdom here!) I presume when they are fully engaged (therefore all spinning together) there should be no noise generated from the plates, but perhaps when they are 'disengaged' (therefore 'clutch plates' spinning at a different speed to the 'friction plates') there is still contact due to the pre-load which means different materials could make different noises? Surely they should not be 'rubbing' too much when not 'engaged' as this would result in rapid wear and lots of heat? Have done a couple of short rides with the new Tracsport LSD fitted and diff back to nice and quiet (relatively speaking) again! Difficult to say how long the Titan will last - R&R said I was lucky to get 4 years out of mine - I think the issue is more with the springs than the plates although as said earlier the Titan plates have to work much harder than the Tracsport ones due to their smaller size. Seems odd to me that we should expect to have our LSD's out regularly for a service - do not lots of performance road cars run plate LSD's and one does not hear of them having to come out regularly? If you send me your email address I will send you the pics of the different sized plates and ramp blocks - tried to post them here, but when I uploaded them they were converted into such small pics they were of no use!