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I put it on my truck and noticed it quieted down the sound and it seemed to run smoother. I ended up checking it with AE and the data clearly shows the FRx improved the PERDELS on mine.
Here is a post from the thread I started after installing the next gen FRx. Read the whole thread for more information.
I dont have any hard data (no AE numbers), but judging by the sound of my own ears it did indeed make a difference for the good in quieting it down and running smoother.
Not be a wet blanket, but I did the hutch mod, and based on my testing, very little air is still in the fuel at the fuel bowl. This mod greatly quieted my engine. I'm wondering how much more smoothness/quietness I would get from the FRx mod. Would it just be another 10-20%, or a quantum leap (as the hutch mod was)?
I realize that the FRx also provides better fuel pressure feedback info, so it's not only about the air in the lines.