I still don't understand what the hangup is for more boost...
It's FLOW that's going to give you the torque / power.
So here's the dilemma...
BIG turbos obviously give you lots of flow, but they don't spin up well at lower RPM's - this isn't your answer, unless you get that big turbo to spin down low.
NOS?
You can try all the little tricks to get them to spin earlier, but I bet it's still not enough...
We're talking divided set-up's with high velocity runners for your turbo exhaust manifold trying to take advantage of pulse tuning, etc.
Pain in the ass and big headache to figure it out...
How about we run individual turbos per rotor?
This takes advantage of the strong exhaust gas pulse and keeps everything divided.
It's an extrapolation of the above, but it takes it one step further from (big) single turbo set-up's.
I can only remember only a handful of people who have tried individual twins, but I believe they have gotten very promising results...
-Ted