Carbon fiber and weight aside, The power output variance between the R and street engines are due to the cam, ecu, and exhaust, and that's all, correct?

Correct.

http://youtu.be/MkzZukDas7w

ZX14MAN64, and possible differences in boost levels.

We don't know what the H2R and H2 are at from the factory, and how its regulated.

That could be the big issue, if its mechanically different.

Carbon fiber and weight aside, The power output variance between the R and street engines are due to the cam, ecu, and exhaust, and that's all, correct?

Along With Major ECU Modifications From Don Guhl.

That exhaust you would not want to touch!

That H2 sounds awesome, if you close your eyes it sounds like a moto gp bike going down a straight. Awesome. If I had that kind of play cash I would order one in a second!