Fuel Pressure Regulator, PSI setting ????? Options

[3TST]

OK, I'm in the process of installing my aftermarket fuel pressure regulator.
Installation seems pretty straight forward.
However, when I come to set it what PSI can I go to?
The manual states between 38-44 PSI as standard.
Can I increase the PSI over 44, if so to what PSI?

Also, what PSI can the standard Fuel Pump cope with?

Any help would be greatly appreciated.

BTW: I have a '97 ST with standard injectors, an Injen IS2040 intake, Denso Idridium spark plugs and Magnecor KV85 spark plug wires.

[3TST]

Thanks for the advice.

I installed my Cosmos Racing AFPR today.
I set the pressure to 40PSI.

I then revved the engine "fiercely" to see what the gauge reading was doing.
Interestingly enough it rises to about 45PSI when I increase the throttle abruptly and when I let the throttle off abruptly it drops to about 35PSI.
It idles at 40PSI.

This seems good to me and safe as it is within the manufacturers setting range of 38-44PSI.

BTW: Having fitted the Injen IS2040 intake, Denso Iridium plugs, Magnecor KV85 spark plug wires and AFPR, I took it for a spin and noticed a substantial difference in acceleration.

When I have my other parts fitted (exhaust, header, high flow cat, underdrive pulley) I'll being getting it dynoed correctly.