Same question. What do you do at a Dyno day? Mines been done for sometime now. What happens if you make my car run worse? Ruin my tune of break my car? Never been sure what is done.
What happens if my numbers are better then your tuner can produce? I've wondered this about these detail days also. Do they tell you a Shamie sucks and you should not let your wax dry on your car. Do they tell you about the master blaster.
Just confused is all. Good luck with what ever it is you do.