This is the AC Delco Ultra Guard Series oil filter that provides
more filtering, etc.
Currently used on the 1997-2004 LS1 engines and LS2 for
2005 & 2006 LS2 takes a PF44, 2006 LS7 takes a PF48. A
2007 LS2 takes a PF48. A 2008 to 2013 LS3 Takes a PF48. ALL LS7's
take a PF48
For those of you with the LS2's you can use the UPF44 or
UPF48 Ultra Guard filter. DuraGuard Your protection from