Just my observations from the above... the standard Evo turbo would be doing nearer 350bhp at 1.7(ish)bar. You'd be into at least an MR turbo with a 10.5cm exhaust housing to be doing 400.

As mentioned above - the fuel pump would need to be a 255lph unit and i'm sure the injectors would be at massive duty cycles.

What cams are they out of interest?

However - i am getting the cravings for an Evo 8 MR