That sound is typical on many clutches. I also have the same sound on my new SD clutch and I know exactly what you are talking about. It sounds like in the movies when a ship is sinking under water with the metals sounds right? yes, that happens a lot.
was talking to another member about a odd clutch type sound i have the exedy twin disc hd, was just curious what causes it or how bad it is or how ot prevent it

 

bump just want to se ei fanyone else has this noise i know wrxtoevo had mentioned it previously