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What is the difference are they two totally different setups? Like a 12:1 FMU is basically the same thing as setting the PSI of the fuel flowing through the rails on an adjustable fuel pressure regulator? Is there a chart for the different fuel pressures. or do you just tune it off of your wideband I'm confused would appreciate help guys thanks

can you run both?

Lulz, are you boosting your car?? I don't see it going well if you use this method.

But ya u need a fmu and fpr. Fpr regulates fuel pressure going in (as u would have more then stock under boost) and the fmu regulates the amount going in based on each psi of positive vacuum, aka boost.