Bigger injectors support bigger horsepower but usually don't make more power on their own. I went to 27psi injectors when I was running HO cams and the superchips because I was running lean at 6k WOT. I think Donkey was right when he said it has more to do with the type of spray vs being larger.

I just bought a set of SVT Cobra 60lbs injectors from a place in Iowa, I hope they are here by Wednesday.