I would like to know more. Is it like what they did for the 7.3 power stroke? Upping the pressure on the high pressure pump to, not just get more fuel but due to the higher pressure the fuel is atomized better.
Would like to know a answer to the above question in running lean. The way I see this working is tricking the PCM into thinking its running a lower boost than it really is. If this is true I can see it running lean.
Not saying it won't make more power (whether it is safe or not is another thing) but to make any of the claims in 1 or 2 would be a good story.
This isn't like leaning out the MAF sensor to get a tad bit more HP while "technically" getting better MPGs, this is increasing boost which increasing fuel is essential as well.
Not to mention you are now REALLY depending on your knock sensors to pick up the extra knock that MAY be introduced with the higher boost. Where a custom tune "should" make changes to the timing should it be necessary.
I think they are saying the fuel rail runs a higher psi so you get better atomization. With that you could get better fuel milage.
This is a resistor inline to your MAP sensor on your intake, doesn't effect fuel pressure directly (not sure if the fuel pressure goes up with boost or not. I thought the Direct Injected systems run a constant pressure but I don't know this for sure).