So the question is which dyno is "right" ? I have had all of my dyno work done on a Mustang. My tuner (who knows how to tune and run a dyno)jml5150 said:Yes. The mustang dyno will post lower numbers. I had my car dyno-ed on both. The mustang dyno read about 15-20 rwhp and 5-10 lbs of tq. less.