One thing that I would like to point out is street tuning. I don't know about the cobb unit, but with something like Osiris(end-user tuning option)+Cipher, one has all the tools necessary to make the ultimate street tune. After all, even the most sophisticated dyno is nothing but an approximation.
With something like Cipher, one can log with ultra high precision how long it takes to accelerate between two given speeds in a given gear. Make some adjustments, and make another run. The cipher logs should be precise to the ~10 millisecond level.
I don't know what the logging capabilities are of the AP unit.
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