Just slightly off topic because I haven't had to change the plugs in my Crossfire yet, but I thought it funny that the suggested NGK plug (BKR7EIX-11) is what I just used in my 2002 Jeep Grand Cherokee with the 4.7L HO motor. That's what that motor calls for, and I had a hell of a time finding them at any of the local parts stores here in RI. Had to order them.

Peace
Paul