If it sounds like a rattle/knock on idle it would very likely be your supercharger coupler. You can verify this by taking the supercharger belt off the car and try turning the supercharger by hand, as it should feel and sound fine (no bearing failure-related symptoms). Given that it's common for supercharger couplers to fail in such a nature (become noisy), it's something that we stock as shown in the links below:
EATON REPLACEMENT COUPLER
http://www.maceengineering.com.au/epages/shop.sf/en_AU/?ObjectPath=/Shops/mace/Products/ETN603
SUPERCHARGER COUPLER
http://www.maceengineering.com.au/epages/shop.sf/en_AU/?ObjectPath=/Shops/mace/Products/ETN604
Please note if replacing the supercharger coupler you would also need to replace the supercharger oil at the same time, which is something we also stock as shown in the link below:
GM Supercharger Oil
http://www.maceengineering.com.au/epages/shop.sf/en_AU/?ObjectID=1469765
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