1. You're going to compare the WGDC of two different vehicles and attribute similarity or difference to the airbox? How are you controlling other variables that could affect WGDC?
2. APR has the lowest flow of the 7 aftermarket products tested. Since I have to purchase the majority of products that I test I have incentive to acquire products that have a high likelihood of performing well, because I could be using one for a while. APR was being put up against some of the "best" intakes that I could source.
3. Removing the housing from the APR intake increases airflow through it substantially. I believe the constraint in their design is the channel from the inlet to the filter section, it narrows a bit. The Eventuri that I am presently using has a similar opening but as the width of the intake narrows the height increases. I suspect the cross sectional area of the Eventuri increases along the flow path and the APR intake decreases, before opening into the filter housing.
4. Both the APR and Eventuri intakes were flow tested in the same manner, with the inlet open without any restriction. The
scoop is something I've looked into as well and the difference it causes is miniscule, less than one hundredth of a psi during the measurements I made at 50 mph.
5. The flow bench exists in the real world. It's a real device purposefully designed to measure airflow through parts like the intake. The measurement device was calibrated prior to each intake test. The "real world" comparison you are planning is a poorly suited means of evaluating airflow through the APR airbox.
See above, the scoop does next to nothing.