just to throw something
here is my first Dyno with my 370z at APH
the car had no mod or tune , 100% stock
the gear ratio is correct
I did 5 pull and those 2 there are the lowest and the highest one
you can see a big difference
Pull # 2 gave the Biggest number and pull #5 gave the lowest one.
always do more than 2 pull to check the accuracy of the tune...