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I got an 07 C6 and ordered the factory filters because they are a cheep as any if you go over the internet.
The only other one I could find in stock was the STP from Auto Zone.
There is a great article on filters, who makes them, and all the stats on material that I am sure you can find by searching the forums. The STP is not a bad filter but I picked up a 6 pack of the GMs that will last for a long time.
I added a big magnet to the bottom of the filter and replaced the magnetic plug with a Fumoto valve/plug. Also, there is some really good info on oil. Us the Mobil that is called out or the Mobil 0 w synthetic.
Wix makes a filter that fits the 2007 LS2s (and the LS7), it's part number 57060
AMSOIL now carries WIX products including the 57060, so for those of you that can't find WIX locally or prefer the convenience of buyng online, you can get it via the AMSOIL links to the left or in my sig.