I should have paid more attention to the other points, when I first looked in this thread. Being that your truck has a s/c, then the inlet of the s/c will be the restriction. More so than if you have the N/A intake, and adapter. Even though just by a tiny bit.
Back to what I was saying about the MAF sensor and tubing diameter. I wasn't completely wrong, I was just under informed. Yes the MAF sensor still works in the method described by BAMA. Where my understanding started, basically, was that if another value was added by an aftermarket ECU, it could take into effect tubing diameter changes, so that it would have a more accurate understanding of the amount of air coming in. Thus being able to tune out any discrepancies. Which is why (Tacomas in this case) URD
has different calibration files for different intakes. Whether that be on the MAF-Cal, X-1, or UCON. To keep the AFR's safe and accurate. The OEM ECM, just isn't designed to encompass all of those variances.
This is why tubing size changes around the MAF sensor, when not using an aftermarket ECU, have to be considered carefully, or your AFR's can range from extremely rich or extremely lean.
Case in point: http://www.injen.com/content.asp?code=mrtech
. Good description there. There are also correlating articles on this in DSPORT or Import Tuner. I would have to do some more digging.
Which TRD intake do you have?