This has been covered ad nauseam on the IWSTI or NASIOC forums. You might want to research there to verify my comments. Dampers do not regulate, they only damp the pressure pulses.
Most think they are a good idea. Some who have removed them said they have had issues with a lean condition on one or more cylinders because of pressure harmonics messing with the injector's ability to feed enough gas at the right time. I think some may have been witch-hunting.
I think all bets are off if you fool with the system (ie,
not stock*). If you've done nothing else to your system or nothing more than a fuel pump upgrade I would leave them/it in.
There are many that run without them without issue (like me). I ran
one damper on my highly modified engine and fuel delivery system. Then, on the next round, I eliminated it. I don't have any of the issues some have reported.
I have big injectors, Boomba rails and distribution block, AN-6 everything and I reamed out the end of the fuel inlet line so it was not necked down and restrictive. Essentially I have no restrictions below .312".
*Oh... one key to success if you want to eliminate them is likely the aftermarket adjustable, variable, fuel pressure regulator, which I highly recommend. This is because the FPR dampens the pulsing.
There are several good ones. I use
Aeromotive. I also mount a
liquid filled fuel pressure gauge so it doesn't self-destruct due to vibration. I highly recommend you mount the FPR off the engine because of vibrations. On the engine it will eventually wallow out the ball seat.
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