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Both Mustang Dynos and Dyno Dynamic dynos, calibrated as per the manufacturer will read ~15% less than Dynojet dynos under similar conditions. But both Mustang and DD dynos can be adjusted, by the user, to read higher or lower. Sometimes they are adjusted to read high so that customers don't freak out when their numbers are lower than their misinformed expectations. But often, they are not. This is why you need to see a baseline run before you can come to any conclusion. If the baseline run is 240whp, then the Mustang/DD dyno is set up to read accurately (as per the manufacturer). If the stock baseline reads 275whp, then we know that it's been fiddled with to read like a Dynojet. Regardless of calibration, the importance is the % delta between stock and tuned (just like garygaryh said).
Shiv
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