Why do you think some Mp3's are getting much higher hp numbers at 7 psi than an MSP? Because they use a bigger turbo!
If you have a T3/T4 at 7psi it is going to push more VOLUME of air out since it is bigger when compared to a T25. It's not just psi, it's total volume. This was confusing to me when I first started learning about turbos too, but trust me and everyone else telling you, a bigger turbo will push the same amount of air from a smaller turbo at a lower psi.
I, however, do agree with you on one thing, I am going to stick with my T25 for a while because I love the instant boost.
