should i change fuel pressure regulator

[Shehadehd]

Someone else should check me, but off the top of my head, increasing to a 4 bar regulator will probably only make an appreciable impact if the extra air is pushing your current setup to its max and leaning out your air/fuel mixture.

Also, a stronger fuel pressure regulator may overpower the fuel pumps ability to send gas through... Not sure if this is a valid concern when increasing only .2 bars