I lost my "I" on the 09, my 07 had it, as the rest have said they all are "I" now. Thank of the savings the MoCo has made by this small change, got's to be in tyhe mil's.
I have been looking for front rotors and most sights list their rotors as Not Compatable between the FLHTCU and the I models. What is up with that. I bought some and they would not fit. The center hole was 2" diameter and my FLHTCUI requires a 2 1/4" center hole.
It's been said in different ways, but bottom line is this: back in the years when carbs and fuel injection were being offered on the same models in same years, the "I" indicated the bike was fuel injected (an option). My 2006 FLHXI is fuel injected, but carbs were still available that year. Also as was said, once carbs went away for good, so did the "I" as they were all injected.