FWIW, I have the Volant CAI and Volant ram air scoop.
I also have, but have not installed a URD MAF blackbox.
My truck has no check engine light in a couple thousand miles.
I have heard that you need to ensure the proper seal of the MAF sensor. The Volant setup, does not use small spacers on the MAF sensor screws and in effect can not be tightened to fully seat the MAF sensor. Adding small spacers allows you to tighten the MAF so there it is secure and done right, no air leaks.
Adding more, so far, this setup has taken a big hit on the fuel economy. Same driving routes, same driving style. Overall though the power is a bit smoother than oem, and better under part throttle acceleration, such as getting on and up to highway speed.
At some point I will instal the URD MAF blackbox, just have not had time to splice it in. I did install connectors so it is easily removed with no rework to the wires.
I would really like to try a Volant scoop coupled with an AFE CAI