I have a hard time believing most aftermarket tuners and products. Let face it they are trying to sell a product and have competition. No air intake gives you 20hp over stock, etc. A lot of times they never tell you that in order to get 'sed' number you need these parts as well. And like you said you may gain HP somewhere on the dyno chart but lose HP elsewhere in the power cure. And then you the dyno issue.. Different brand dynos give you totally different readouts.never heard of it before but it seems like something is hiding in the video.
why would you not show the after dyno screen long enough for someone to see the real numbers ?
or better yet compare both runs in front of the camera !
naaa lets just tell them we gained 35 hp but make sure to not show them they lost 40 hp on the low end.
Stage 3 Motorsports sells a module by AFE that does the same thing and has an even simpler install than that video shows