i had my car dynod on a mustang dyno, do they run numbers higher or lower than other dynos? and witch dyno is the most accurate??

 

Mustang dynos usually register lower than the others...

There is really no definitive way to tell which are the most accurate... All you need to think about is the difference from when you start tuning and when you are done tuning...

its impossible to compare one dyno's numbers to another's..

 

this man gots the right answer.

compare the first pull with the rest of your other pulls. and see how much of a hp/torque increase/decrease you will get.