Only problem is, for such a large unit it is only making 1psi +ve pressue
A good ram air system can do that
1psi = 2.036"hg
so if it is going from -5 on the boost bauge (most boost gauges read vacuum in InHg) it has made 7InHg difference
My feeling is, that if you took the electric blower out of the intake and ran the car with just an intake pipe the difference would be even less.
Stao, have you thought about using a compressor out of a centrifugial supercharger? They are designed to use less shaft RPM to flow the air.
If you can get the electric blower to move a heap of air at low shaft rpm you could be onto a winner