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Old 01-11-2013, 05:13 AM   #53
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Join Date: Feb 2010
Location: Germany
Posts: 180
My Ride: E46 330xiA
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i can't confirm, becouse this information is not correct.

e39 530i fuel filter (with pressure regulator) is 3.5 Bar (like E46) - but the pressure regulator is "changable" becouse its secured by a splint. You can release the splint, remove the stock 3.5 bar pressure regulator and replace this one with a bigger one (4.0 bar or more...)

but be careful:

the stock fuel pump is only able to deliver enough fuel @ 4,0 bar. More pressure = less fuel, becouse the stock fuel-pump isn't able to produce so much boost on the fuel rail @ WOT!
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