yea, navistar/international. they pissed ford off something fierce with the injection issues with the early 6.0L, also with the V6 based off the 6.0L. ford went and developed the TT 6.4L pretty much on their own because of it. there were also a couple small (3-5L range) TT V8’s ford had that i was working on a couple years ago, no idea where those stand anymore.