Stock pressure it should be set at around 2.5bar i beleive maybe wrong so wait to get a 2nd opinion on this
But if your car has a few mods then it will need to be abit more, but we will have you no all the exact mods you have on your car to give you the correct FPR pressure.
Honestly i cant see the point of an FPR on a standard set up.
And even if you know every last modifaction on his car,how will that help you?
Every single engine is different,and every engine takes differently to mods.
A guideline until its checked properly yes,exact pressure i doubt it.
Not having a go,just saying lol
I hav a de-cat , full exhaust system filter so taken it to west coast performance as soon as I've the Fmic , filter relocation kit and walbro fuel pump fitted