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6.0 Blue spring upgrade kit powerstroke fuel regulator kit,Replaces 3C3Z-9T517-AG Functions of the 6.0 blue spring kit upgrade Increase fuel pressure 10-15psi ,increases fuel injector life of your Ford 6.0 Powerstroke. Fits the below Ford 6.0L super duty vehicles: 2003 2004 2005 2006 2007 FORD F-250 SUPER DUTY 2003 2004 2005 2006 2007 FORD F-350 SUPER DUTY 2003 2004 2005 2006 2007 FORD F-450 SUPER DUTY 2003 2004 2005 2006 2007 FORD F-550 SUPER DUTY 2003 2004 2005 FORD EXCURSION Easy installation: complete kit with all accessories for installation, few minutes done.Package include 1*upgraded blue style stainless steel spring 1*fuel pressure regulator housing 4*rubber O-ring seals 4*bolts 3*orifice seals