Well, first off i do street tune a little bit depending on the car and setup. Explain how you find mbt at any rpm when street tuning? How can you accuratly calibrate a maf curve if you dont know how the driver is driving the car? An etune can get you close and safe but not the full potential. On a dyno everything is safe and controlled and you can monitor so much more. Newer dynos simulate load a lot better than the old dynos so that is not an issue any more.
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