Aisin AMR500 supercharger

[Fit]

Retarded question, why does it look like there are 3 large round ports on those Note superchargers? One being the throttle body. I haven't been around superchargers for a while, the ones I recall had an inlet and outlet.

I was wondering as well at first whey there are 3 holes. It’s because they have a bypass when the SC is not engaged.
You can read all about it here:

https://www.marklines.com/en/report_all/rep1329_201409