Well, technically you could have it map itself on closed loop, but I wouldnt advise it, instead it would be best mapped on a dyno and then use the closed loop only to keep the mixture tidy at cruise and light load, but in terms of its capabilities it can run upto 22psi on its internal MAP sensor, and then upto around 3.5 bar (!!) on an external sensor.
The latest firmware is good to do almost everything you could ever actually "need", programmed outputs for Fan and NOS control etc, its pretty cool.
Sorry - gone O/T though. 4 branch manifolds good idea - turbo manifolds also good idea - go for it ken 
