The problem is precisely that gap. If you move the wrx upto a VF39 then the STi needs a bigger turbo. problem is that the next thing worth even having would be an 18G. This would be nice because then the STi would be putting out over 300whp stock, but it would hurt long-term reliability for the car.Originally Posted by 302@12psi
I think the wrx needs a turbo that can produce ~ 230whp stock (around stage2 wrx power, but with more breathing capabilities of a slightly larger turbo) and the STi needs a turbo not quite as large as an 18G that can produce ~ 280whp in stock form.