I'm
 finally getting around to doing the clutch swap in my CTS-V...
I'll be posting pics of my progress.
I am almost positive my stock dual-mass flywheel has begun to fail and  come apart.  I have a considerable vibration in the drivetrain which is  still present with clutch engaged as well as while parked and in  neutral.  That rules out the trans, driveshaft, rear, and tires.  Also  for a while now the clutch had hydraulic issues with the slave not fully  disengaging, or so it feels.
To solve all this, I'm installing a new GM ZO6 LS7 clutch setup with new  one piece flywheel and new hydraulics.  I also have ARP flywheel bolts  and ARP pressure plate bolts. And I even went ahead and got the remote  bleeder line from LAPD so future bleeding will be much easier and I won't  ever be dumping old fluid inside the bellhousing.
Tonight I just put the car up on jack stands.  And gave it all a quick  look over underneath.  Tomorrow I'll be dropping the exhaust and pulling  the driveshaft.  I gotta make sure to mark driveshaft in order to  ensure everything lines back up the same way to avoid and other possible  vibrations.  I'm in no rush to do this so I'm taking my time.
more to come tomorrow...