These are the ngk 6510 one step colder with nearly 10,000 miles on a 91 unleashed tune, if I go back to stock configuration, can I keep those plugs in or go one step hotter, factory plugs?
I googled the part number but didn’t have much luck
Do I just need to call ford?
It’s the hose that you take off to install the ford performance oil separator
I want a spare in case something breaks on the oil separator since I can’t find individual parts for it