The US has a 3.5 bar FPR, but I had a 4.0 bar with the Dinan kit.
That has nothing to do with the fuel pump.
The US fuel pump and Euro fuel pump are the same for the e36 m3's.
A larger fuel pump would only be necessary if you are exceeding 400 rwhp.
I'm running stock fuel pump with 3.5 bar FPR, and getting far more fuel delivery
Than the stock s54 or euro 3.2.
Now for the high flow cats....