Depends who your map provider is. bluefin Superchips will run at stage 2 with no pump. I run full milly turbo back, forge Twintake with no issues with my Dsg ed30.Shes producing over 300bhp.
Unless this has changed recently, Revo's code their fuel pressure higher the Superchips, and they recommend fuel pump on their stage 2.
Depends how far you want to mod, if your thinking towards Stage2+ then go Apr or Revo.But if a full turbo back and intake is what your gonna call the limit, then Bluefin Superchips map is very good vfm.
Revo may give you an extra 10bhp higher on the rolling road, but on the road, you will find the car with less torque and horsepower with get the power down easier and not necessarily slower
! Unless you mod further to help traction etc.
There is no limit with the dsg to worry about.
HTH