Sigh. Different dyno's read different numbers - ESPECIALLY if a load is put onto it! A Mustang or Dyno-Dynamics dyno will generally read low. Altered Atmosphere's dyno is a Dynojet dyno, which doesnt put a load on the motor. They always read higher than others. I will put money that the OP's dyno was a dyno of the type that puts a load on the driveline.
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I don't own a car anymore.
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