Ok ive been a NA engine guy for a long time and am justing beggining FI setups. Now my question is this on a stock engine does 10psi from say a t3/t4 turbo affect internals differently than a lager turbo. I've always though that it would, but some doh head is telling me 10psi on one turbo is the same as 10psi on another larger turbo.

 

the power output that you get from 10psi of one turbo will be different from the one that you get from a bigger turbo, plus you have to consider that fact that the lag time increases because its a larger turbo. you have to pick the right setup for what you want to acheive and what you are aiming for.