My S13 SR fan shroud is like Chris's. 1 piece with the little strip to pass by the fan.

Quick question. Boost gauge shows proper vacuum, but I'm getting a slight hesitation when I floor it. Almost feels like a boost leak. But if I ease into it, and then floor it, it feels great. Any suggestions of where to start looking?

Edit, also I have an R32 GTR fuel pump. And this thing is LOUD as fuck. Are they this loud stock, or is mine taking a dump? It may be fuel related I guess...