I changed my plugs in the 2010 PP @ 33K..car has been tuned for 22k.. 4+ most of the time..the plugs that came out didn't look to bad at all.. the plugs were gapped to almost 0.038/0.039/0.040..plug pt# CYFS12F-3.. Now for 29 bucks I replaced all with MOTORCRAFT SP-534 and all came pre gapped 0.030 checked with a feeler gauge..the 534 is the new plug for the '13. made by NGK. Took for test drive and WOW!! feels much more smoother and No more rough idle. Car is more peppy and quicker.Runs better than ever and Im happy I changed them.
New plug
New plug
