I don't log fuel trim! (ANYTHING: boost leak, less than optimal injectors, o2 sensor ect can affect fuel trim % and my car is old). If air mass is high, timing isn't being pulled and air/fuel is what its tuned to be why should I be concerned about long term fuel correction? If there are intakes that pull more air and/or allow more timing advance great. Working better and broke aren't the same.
I never made a dollar per hp argument, you keep saying that when I say ass-o-meter( perception of feeling its doing something). They are not the same. APR HPFP + GOLF R intercooler ( both done at the same time along with fuel pump flash) didn't register that high on my fun factor either. The quicker boost response along with power boost of the catless DP was instantly more gratifying. May be lots of parts or combinations that make similar hp, tune followed by DP are by far most satisfying to drive. Matter of fact I'll go as far as saying once you've done that only a turbo upgrade ( maybe water/meth don't know) is satisfying. Might as well do suspension after tune and DP...does not mean you can't get more hp...but u still have just another stage 2/2+ and still going to want more after 30 minutes of name your bolt on.
FWIW, just uninstalled a P-Flo for a TWINtake, the P-Flo was at +14.8%.
It "felt" fine but ran like hot garbage. All of them I've worked on have had a fuel trim in that range and had the car running like crap (rich, poor advance).
That's 4 of them, including mine that's had this issue. My car has had good fuel trims with every other intake.