Never heard of a shop in Atlanta with a Dyno that doesn't have a rate to do pulls or rent it out at an hourly rate, especially TopSpeed
Every dyno reads differently and theirs is on par with every single dynojet in Atlanta. This is fact.
E46 M3's do around 295-305 there with headers and their calibration, that's pretty average if anything less optimistic.
One ATL shop that people have tried to prove reads higher is Mainstream, but that's been argued by reputable people claiming the airflow is better there, or the humidity levels were lower etc. etc.
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