Any thoughts about replacing the factory (I guess paper-)airfilter in the air intake box with a
K&N airfilter? I am looking at changes in sound and peformance (probably nothing), but also disadvantages because of an oiled cotton filter.
Changed the OE slab filter on my Roadster to matching K & N one. They have a better flow confirmed by slightly louder intake noise when you blip throttle. They are also washable allowing re-oiling and should last a lifetime. The adaptive mapping should keep mixtures correct and may even improve mpg a tad.
Very likely K & N offer similar for your GDI. You would need to know which Ford model the air cleaner came from or cross-ref from OE filter.
Although sceptics will advise you of MAF sensor fouling I took mine off to clean recently having had the K & N on for nearly 20,000 miles during which time it was cleaned and re-oiled twice. No hint of contamination was found on it
