we looked it up by the the part # and it said one piece.just put them in,so in about 12000 miles i'll pull'em and see what happens.according to motorcraft this is same heat range.
I'd really like to believe that those are one-piece plugs but I wouldn't bet on it. I see a definite seam line where the shield connects to the body. Those are most likely two-piece
Your originals look nice and clean, how many miles did you have on them? Did they give you any trouble coming out?
just hit 50000 miles.i pull them out every 20000 and clean off the smooth area and the tip.i also have 2 sets of the ht1's that i use.i pull them when the motor is warm and don't force them.champions don't work for crap in any ford i have ever had.this is my 5th mustang and i've had many other fords thru the years.