JimiH
You arent getting it tuned thats the difference..
$60 is all you should pay and they usually give you 2-3 runs and should take 1/2 hour or so..
The main thing you have to know is what dyno figures you want..
The lower reading dynos being Formaz, PSI, rotormotion, United Fuel injection getting higher is Barries Dyno,Genie, then Myaree.
These are the ones im familiar with I would probably go to Formaz myself, I wouldnt mind getting Barrie to tune my Car but i think he reads a bit high if u want a true figure..