read...read...read....some guys are cranking 21-22psi but you get heat issues
you go 62mm SC pulleys on Stock Crank
or 65mm pulleys on 181 cranks - extreme
or stock 75 on 185 crank
not sure if someones running a 62 with a 185
I think there's a 178 out there as well.....

see attached picture - although this assumes linearity of psi with rpm and I dont think that is the case - but I stand corrected.

Note also - boost isnt everything - density is everything....but density is promoted by boost sure
- but low AIT's also promote density
and on that....
The lower you can get your pre supercharger air temps and humidity the more efficient it'll run.
That's why people talk about altitude, track temps and humidity and its effect on AIT's

Humidity is your enemy - H2O vap is useless - in and out as H2Ovap - it takes up space
Although H2O (liq) is another thing.
People spray water into their intakes or post charger, but although its evaporation can cool temps to down as low as wet bulb temps the resulting H2Ovap (now useless) displaces available O2 for burning. Others spray it on their IC during WOT to bring SC operating temps down.

Most people cool post supercharger.