I have an '08 with the Cummins and manual Transmission. The clutch started slipping at about 80k. The shop highly recommended going with a single mass flywheel. The dual mass has it's problems. I don't pretend to know what a dual mass really does but it certainly has it's distractors.

“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell

It's not over when you lose. It's over when you quit.