we had a car on the dyno once that the customer had fitted his own MW Opt 5 Twin plate, it was noisy and it started slipping at 430 rwkw, he asked us to pull it apart, we found he had fitted the intermediate black backwards so only 1 clutch plate was locked but also the nylon anti rattle bushes were not making contact, we cleaned it up, refitted it correctly and it was good and quiet