He sells a chip that he advertises as an 80 hp increase. He sells injectors that claim 40 hp increase.

I seriously doubt that there is any dynamometer data to support those claims. I know by experience that one cannot add 80 hp to a 6.5 simply by changing the chip. At the very least, they are inflated marketing hype. To me, that is lying. To others, that is good advertising.

In my opinion, if one is to make a claim of adding a certain magnitude of power, one should have some data to support the claim and be willing to present it.