I read some on these forums that at a certain point down the FI road, our cars just haven't been able to get all the power down without major work on the suspension and such. To beat the GT-R with a swap, you'd probably want to take the AWD setup.
If you were to swap that in, besides the turbos and plumbing, I think once you added the extra differentials, the transmission, any new coolers, and any necessary electronics you'd be about the same weight as the GT-R. 400 pounds would go really fast. You could gut it and/or increase the boost, but you would want to do the same thing to the GT-R if you want a fair comparison.
I wonder how much downforce the GT-R produces relative to the Nismo 370Z. That's the only thing I could see as a potential advantage for the Z, but IMO it's not enough to really matter.
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