I have both 42# and 35# injectors and want to ask about a adjustable fuel pressure regulator. Can I use an adjustable one that fits a 5.0 cause they are on ebay but cant find one for the 2.3. I want to run 20psi+ safely and want to know the best route. Should I just use the FMU setup or AFPR? I have had work done to the head such as porting, cam and what not so I want to push more air now/more hp. Need to know what to set the fuel at. I know I will have to lower the pressure for the 42#ers but do I even need them yet? Thanks in advance.

2point3turbo,

The folowing is based on reading past posts and not from experience.  I believe Brad has set up his computer for the larger injectors, either a reprogrammed chip(?) or presently a programed Mega Squirt.  I suspect you will need to set up your computer for the larger injectors for best results.  Adjusting the fuel pressure down in order to run larger injectors with a stock programmed computer is not optimum.  Using a FMU to get more fuel from the 35's may push a stock fuel pump past its limit at 20psi+ boost and does not give good air fuel ratio control.  Using a wide band O2 sensor is useful when going beyond the factory stock operating parameters.