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^its in the original GB thread. (18 Z4Ms)
Zubi had an issue that forced him to return the tune.
A couple of others had what looked like rich running cars.
There was discussion on post-tune dyno methods and ECU adaption time.
....nothing conclusive one way or the other.
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'21 M2C Hockenheim Silver
'18 718 Cayman S Lava Orange (sold)
'13 E92 M3 Santorini Blue (sold)
'07 Z4 M Coupe Alpine White (sold)
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