In this case...
The PWR VE COMMODORE featured at the 2007 Summernats was using the new M122 Supercharger. This car has 440+kW at the rear wheels and has a boost pressure of 11psi.
ah damnit.... I missed it was an M122 rather than an M112, got me hopes up again that 500bhp at the wheels may have been possible with an M112, oh well.....