onefastbob said:This is for future reference. Today while snooping around the www.brenspeed.com website I noticed that according to Brenspeed there are 2 completly different spark plugs for the 2008 Bullitt and 2008 Mustangs. Something about before and after Feb production date. I then checked the Motorcraft website and indeed there are 2 different plugs listed. SP462 Motorcraft gapped at .054 for cars with black coil boots and SP509 gapped at .041 for cars with brown coil boots. I realize that it will be some time before any of us need plugs, but this may be a big issue when the time comes to change them. It would not be good to try to put the wrong plugs in as the threads may be different.
It has been a while since I have done it myself, but you can just regap plugs to the correct gap size though if you can't find the correct model number, right?