Other than the creative and adaptive individuals in their own garages, it would take a big manufacturer investment to move to tuned port injection. The next environmental phase (emmissions at full load) will likely push the manufacturers back to this technology though. When they are required to stop dumping fuel for knock suppression they will be left with few alternatives at which point there will be a water adapted equivalent to the currently sophisticated fuel systems and the ECU will tie water and fuel flow together.
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