I'm not sure but the one thing I've discovered this past week in my search to find the right turbo is that most people who don't opt for the bigger turbo end up regretting it eventually and go bigger again. Even if you don't use it to its full potential initially. I started looking at a td04 19t hybrid for my 2.0ltr wrx but then after reading people's experiences decided on a td05 16g. But then on further reading decided to go for the td05 16g evo 3. But then after further reading it seemed that the evo 3 was so close in size to the 18g that the opinion was to go for that. I'm finally sticking with that I think although there are opinions that a 20g is also feasable. I have no intention of using the 18 to its full potential at the moment but at least I know the option for more power is there. All turbos seem to be available with various inlet sizings and A/R ratios which I don't fully understand but think it allows bigger turbos to have less lag/and more drivable. Hope this helps. Sent from my HUGO-H1 using Tapatalk