Why ruin naturally aspirated status with turbos or supercharger
Answer: The challenge.
The challenge, to me, is to make the extra induction pressure as transparent and inobtrusive as possible, I mean, short of just slapping in a 9.0L Lambo offshore powerboat engine and calling'er done.
Examine which blower produce which boost at which heat levels. Some blowers add more heat to the intake charge for the same boost level, which is an indication of inefficiency. Good luck getting any makers to provide statistics on this. you may have to rig up a test rig yourself and drive it with an electric motor.
Example: 5000 RPM blower snout speed, stuffing air through a controlled orifice, results for example: 11PSI, 180 degrees F.
Then match all the other blowers to that 11PSI, with same orifice, and check RPM of blower snout, and degrees F.
Also, monitor amp draw of electric motor, and you will have a good idea of your power input to the blower.
It just depends on how thorough you want to be.