I have had my supercharger changed. It was still rattling. A month or so later they did the snout. Still rattling. Waiting until spring to fight GM on this issue again. The new supercharger and snout that GM installed for me both have the spring loaded isolator. I started a thread a while back about the same issue. If you search back, you can watch the videos I posted. Try this link:
http://www.camaro5.com/forums/showthread.php?t=456785