I understand your flow... but I still think the TAG units are junk.
I would think that if a test were done where you take 50 trucks and tell the drivers you are installing the TAG on each one. Then only install it on 25 trucks, no one could tell the difference. They would all say the truck is "more responsive", "gets up on boost faster", yea right.
Tag is useless, and gets thrown in the same corner as the larger exhaust. Were the larger exhaust does help, just not as much as most claim. When you buy something and expect or foresee an improvement, you do not make for an objective critique. You have a pre-conceived notion that a performance increase will happen, so your mind rationalizes a positive change. On the larger exhaust, that rationalization is further backed up by a auditory sense of a louder exhaust note, so there you have it, the box said it will go faster it must be true.
I say to you, Cummins seems to be pretty much up on things. If the TAG was so dang good, why isn't it installed at the Cummins factory? Or better yet, Let me know if you see one in the new 600.