Its an Eaton M45, an off the shelf supercharger, easy to find info.

Its NOT about boost pressure though.

Its about RPM.

At the same rpm on one engine it could give 50psi, on the other it might not give any.
And trying to get the same boost on a different engine would mean changing pulley ratios and overspeeding it like a mutherfucker.

But yeah, you can get about 19psi on a standardish flowing CooperS lump, but even that is well over the allegedly safe (according to eaton) RPM level of the charger.

Ive got one at home.