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Hooked up fuel pressure guage off fuel rail today. solid 35psi startup and idle. I go WOT and it jumps to 55~60psi then drops down to 45psi.

Is that too hight for a 3bar FPR?

It's either FPR, Fuel Filter or Fuel pump

Anyone test their Fuel pressure at WOT?

2000 9-3 SE stage 4 (hardware & Software)
 

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Are you actually "flooring" the engine as you observe the pressure ?
I do not think this is a good test....
Obviously the pump is good, the fuel filter is a service item and the regulator should be OK.
Use your vacuum pump with gage to check this out, to be certain. If this leaks a little gas , it will upset the smoothness of operation and the MPG.
I think that when the engine is raced, the pressure will increase faster than the system can adjust it...This time will only be a second or three..
 

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One bar is barometric pressure x one. One bar at sea level is close to 15psi. 3 bar is close to 45psi. Intake manifold pressure is used to tune the operating fuel pressure by means of the small vacuum line connected to the FPR.
 
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