Unsure how they do it at other locations; but I had to sign a waiver,giving permission & I was responsible if an internal engine failure occurred.
As mine had around 65k at the time of tuning (May 2016) and currently has 85k on it.
After the tune; everything was much more responsive & if tire's broke loose in 1st or 2nd...gotta pay attention to shifts/ as mine has bounced off the rev limiter numerous times.

Just because a shop has a dyno doesn't mean they know how to use it.
There are so many hack shops in this part of the world and it's probably no different where you are.

Hmm yeah fair enough. Yeah I had some members from Zclub Australia send me their dyno sheets for the stock Z, and they all showed around 190-200 rwkw (260-270whp) even on multiple and different kinds of dynos.

So yeah, I believe my reading was definitly not fully accurate and true.

All good, I was on a low timing MAP. Had a higher timing MAP activated and ran 1 more psi and got very good results!