We all know that the other mods are needed for big power, so there is really no need to discuss/argue about them.
Pretty much every highly modded car has the same mods. IC, Intake, charge pipes, Catless or Hi Flow Cat, Exhaust. There doesn't seem to be much variation between these items in terms of how much performance they deliver.
So there are major 3 variables: bigger turbo, bigger wheel, tune.
I, and I assume most others who have been discussing this for so long, just wants to know which deliver the most bang for the buck, or how little they can spend to get to the desired power level reliably. The results seem scattered out there.