Why does a Maggie have a whinning noise and procharger does not? Just curious, I personally like the whinning noise.

Why does a Maggie have a whinning noise and procharger does not? Just curious, I personally like the whinning noise.

I'm not 100% on this but will give it a shot, I think it has to do with the Maggie has those 2 screws and the air movement around them??? Where as the procharger is just spinning. You know what, this is a great question, I hope someone how knows the answer 100% jumps in here!