787?
Are you talking about the LeMans winning vehicle?
What does that have to do with the RX-8 MSP engine?
IIRC, the 787 used a 4-rotor, PP engine.
So, I really don't understand your point.
If you think your MSP engine will outdo anything PP (even the older 13B PP exhaust), then I think you're smoking crack.
Please do your research first - SAE is a good start.
http://www.sae.org/
The advantages of the PP port over a side port is thoroughly documented.
The only benefit the MSP has over a PP is the minimizing of the (port timing) overlap.
Less overlap means for better emissions.
Don't let the 200+ quoted hp ratings fool you.
It's more due to the higher redline.
Keep in mind, at BP motor with the "older" PP exhaust will produce the same if not better numbers than the MSP.
-Ted