DI is a rebadged FICHT, based on the same principles. Evinrude/OMC/Bombardier/ Jets Marivent, or whatever they called themselves at the time had to carry out a bit of hasty re-marketing after the notorious early FICHT motors fell apart, so the DI came into being.
I'm told that post 2002 FICHTs are ok, but the earlier ones are a bit dodgy.
Info on
www.iboats.com