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How similar is your setup to the OEM fuel injected ninja?
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In a few ways its very similar: same throttle body and injectors, same operating fuel pressure (about 42psi).
But there are more differences than similarities: my system is "fuel only" right now which means that the bike's original ignition box is still controlling the spark. also, my fuel system doesn't use an in-tank pump (it uses an external pump with a fuel cooler on the return loop).
Next spring/summer I'll be continuing work on my project bike to include ignition control.
But on the whole I'd say that my setup really is pretty far removed from the OEM version. The factory fuel injection uses a lot of tricks and enhancements that derive from high-dollar engineering development and years of experience both in fuel injection and ignition control.
I don't think the differences make any noticable extra horsepower, but what they do for Kawasaki is deliver an absolutely bullet-proof, smoothly integrated, reliable and thoroughly ridable product that can be confidently sold to the general public.
My project bike, which starts and runs great, will always be something of a "work in progress" and is probably a bit more delicate and somewhat less reliable than the OEM bike (I won't be taking it across the U.S.A.), but I know that and because I'm the responsible party it's okay with me. I certainly wouldn't sell this bike to somebody who didn't know as much or more than I know about fuel injection.
If I did can you just imagine the posts that the new owner would be making here on the forum about what the "prior owner" did to the bike?