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Call can put on their single pipe and head which will produce the same HP as the carb model.  This will give you 150-151 HP.  You cannot put reeds in with this setup because you will encounter a lean bog on the low end.  I've briefly checked because my next zr will probably be an EFI.  I know someone who has done this and tested it on the dyno to find the claims were accurate.
The best performance gain for the dollar is clutching, which unfortunately takes much time and heartache!!
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