I looked into changing plugs and found two Motorcraft listings, SP 519 and SP548 listed for Boss. Any difference between these two.
Also even though I have only 14k miles the car was built 4/2011 so I'm not sure I want to leave them in there much longer. FWIW my son pulled plugs on his 2012 F150 5.0 and with 30k found the gaps all over the place so doubt eng plant does anything but screw them in right out of the box. Noticeable improvement in how the truck ran especially at low rpm.
Also even though I have only 14k miles the car was built 4/2011 so I'm not sure I want to leave them in there much longer. FWIW my son pulled plugs on his 2012 F150 5.0 and with 30k found the gaps all over the place so doubt eng plant does anything but screw them in right out of the box. Noticeable improvement in how the truck ran especially at low rpm.