girls who are into cars are friggin weird. i have dealt with them before. you cannot argue or try and tell them what they are doing is not good and will not be practicle etc etc.
they have an idea and they have this big mission to be cooler / faster then all the boys and they usually never change their mind, most of them have the car off the road for years and years untill they slip out of the scene and just sell it or just keep it and never actually finish it, the ones who do finish it are pretty rare
so instead of trying to tell her to change her mind (waste of time) just stay out of it or try to suggest how to get to her goals.
500rwkw out of a non turbo neo engine will cost lots of money, the engine should probly be grout filled and the head would have to have extensive work as this engine will need to rev past 8000rpm as well, i would think this build would cost 25 grand or more before it will be completed, a decent 26 crank will need to be used etc etc
I have tuned a T51r high flow in a R32 GTR, it will get you around 400 - 450 rwkw on 20psi with pump fuel, and once you turn the boost up to 30psi with c16 or roo 16 you will spin around 600+ rwkw depending on how the car is built.
So yeah the T51r is the turbo to use. remember this car will not be a car that will go fast on the street. you will get beaten by a hyundai excel at the lights and the car will just be a dyno queen with no other purpose.
good luck with it. keep us all posted with the progress. I enjoy seeing what the chickies do to try and make a statement. its great entertainment