I was getting ready to order a set of IT-16, but the eBay seller whom I was buying from ran out. He offered me $16 off a different set of plugs. Would the colder IT-20's be okay to run on a completely stock 5.4, or is this heat range too cold to clean itself?

I don't drive in the city much, and I'm pretty agressive on the interstate.

 

I would only run them on a boosted application.....

 

it20's are way too cool for your application, I use it16s with boost and they are cool enough at that.

 

Guess I'll stick with the 16's... When I find some for a decent price.

My Motorcraft plugs are fairly new, but I have a new set of Visteon COPs on the way. I figured it'd be a good time to try new stuff.