140ish awkw for a completely stock VQ25det RS... so around the 190-200hp mark, yes.
Yeah, but yours is designed to bolt on to the stock engine, not a built one... plus you have 1 turbo, not two.
450ps is still around 315kw, so fun is to be had regardless of numbers
For $20k, you could get a built 3.8 or 4.2L VQ35 and use the spare thousands to setup a turbo kit to your specs.
Should be able to see BIG power and torque with that kind of money spend of a VQ35.