For your second question it sounds like the G-Tech has the incorrect numbers as you believe. It's a rough estimation based off G-Forces that the accelerometers measure when you accelerate. (If I'm assuming function correctly) If this is the case the formulation would work out that their assumed constants are incorrect and as such would need to be altered to match the more accurate reading of the dyno pull. However this also depends on your VE and how accurate that measurement is.
Your G-Tech by all means could be accurate and your reading of the VE could be off. As it stands your VE and your Max Torque reading are pretty close together. What you need to find out is how accurate your measuring tools are. Is your G-Tech able to measure max acceleration +/-500 RPM? Remember, 500RPM isn't that big of a discrepancy as we already miss 250 when our engines are off (aka our tach isn't reading anything below 500rpm)
Making any sense? I would first quantify the accuracy of the gauges/measurements independently and see if you can rectify any inconsistencies between them. Then, and only then would it become beneficial to measure the differences in VE, Torque, and RPM between the two manifolds.
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