2012 Focus SE and 2016 Focus ST. Are you sure you're correct about cylinder head replacement pertaining to DI? The closed deck Ecoboost 4s have an issue involving cooling passages, which is what took out the ST at 180k, though they recommend engine replacement. I never bothered to look at the valves because there was no drivability, performance, or mileage issue and I have better things to do, though I wouldn't doubt I could have taken pics of them and made a youtube video with me making a Home Alone face in the thumbnail and an "OMG gEt 4 c4tcH Canz!" headline imploring people to click the link to catch cans in the text below the video (if you mention my name, you get 10% off!) or else their engine will blow up and remember to smash that like button! I think it's a largely overblown issue a lot of people saw an opportunity to exploit people who care about their cars to sell chemical cleanings, walnut blastings, and catch cans. There are a lot of DI cars on the road and there is no way the majority of them have been treated to the various snake oil services or else there would be cars all over the place barely limping along. Anyway, this car also has MPFI.