[TurboNova]

I say "Must" because it is the right way to do it for no other reason. I still think even after all the posts you still don't get it. It's not lowering the pressure but more the reason is the pressure differential between the intake and injector remain the same, no matter if you are in boost, vac or no vac.

Do you get that part?

Then the ecu just tunes the actual fuel curve and not the fuel curve and the pressure differential too. This gives the ecu a better ability to tune at the lower PW for any injector size.

If line length was an issue then your rear mounted regulator wouldn't work under boost. The long line will make the change slower but it will still work just the same.