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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.