Gruppenzwang says that with its OPF test tube there is no error message ...
Tuning box manufacturers quote ridiculous HP gains/claims but nobody sees those, not even close. So take everything you see as marketing blurb and a bit of salt.
Until there is a "dummy module" that cancels those sensors out or just fools them with fake figures, there will always be a light. Doesn't matter if one pipe takes 100 miles to show error or 1000 miles, it will come on.