None of this stuff is new. Don't forget these cars came out over 20 years ago and top tuners have already been there, done that, got the t-shirt. Extensive dyno testing has been done with lots of different configurations so what works and what doesn't is pretty much known.

I personally have tested the metering unit and found it simply doesn't want to flow much more than about 230hp worth of air (in the car with everything else). Make of that what you will.