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im not an engineer but lookin at the new 6.2 model at the autoshow it looks fairly simple for a cylinder head company to take a set of heads and design them for direct injection on gen 3 and gen 4 motors. but then that would also require redigning fuel rails, injectors, and an intake manifold. probably not worth it
Agreed^ doing DI makes you start changing stuff around for the same reason. Labor for all that is also more expensive.
I think this is one of those situations where if you car didn't come with DI straight from the factory, it would probably be cost prohibitive to do a conversion, and for not very much gain at the end of the day.