Your whole theory about "turbine inlet pressure" being the #1 factor in turbine efficiency is flawed. It's obvious you don't understand the basic theory of turbines in that they convert thermal ENERGY, into mechanical, and that pressure is secondary.
The whole fact of the matter is that you're acting like a sea-gull: you come around, make a hell of a lot of noise, sh!t on everything and then leave.
Take a look at the turbo kit on a Contour and realize that there's no way in hell that 2 turbos of even the GT-T28 size, will fit in the Contour's engine bay. It's common knowledge that a Focus has a large engine bay to start with.
Plus, so far power output numbers on the turbo'd cars out there has been limited by static compression ratio. i.e. as high as 10.25:1 (like my 2000 SVT), thus boost is limited = = power output is limited.
A ZX3 has a compression ratio of 9.6:1 and Tom's 460hp Zetec has upgraded internals.
Wait until Jim's car is finished (forged low comp pistons & forged rods), then we'll compare numbers.
