You would be fine running 555's as long as you get the ECU program to run them. Nothing wrong with planning ahead.
gpelite wrote:I have the NA fuel pump which I know is good a little past 370cc (TT injectors) and a booster pump to makes sure there is enough pressure in the lines at all times for my demanding setup.
The stock TT pump, although better than the NA, still may not be enough
What?!?!? Stock TT fuel pump is fine. There are lots of people making 700+ hp on stock Z32 fuel pumps.
For search purposes.....you DO NOT need to upgrade the fuel pump on your TT Z32 to run bigger injectors whether it be 555, 740, 850, etc injectors.