Yes your right, there are alot of variables to consider!
As for my setup, series1,full 3" ex, pod, HKS evc4 & afr (~12:1), on BP98! Im running 235/45/18 worn factory rubber, on lighter rims! Dyno'd in 2nd in snow mode & locked torque split mode on a very honest 4wd dyno! 25ºC 46% humidity and it was a high pressure sytem at the time so maybe 1005ish hpa, also late arvo near sea level........... anyway i was making a bit of a point, that comparing numbers to argue an engine being either good or bad, is hardly fair (as you stated yourself)!
Im all for the VH45, i reckon it would be an awseome engine to put into a stag, that being said, i quite like the VQ and even VG motors, heck almost anything Nissan is good!
It would certainly be quite a unique stagea atleast!