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I think the Sabb one was from tunit??
I had 3 faulty ones for my E46 and then two faulty ones for my A3 and gave up with tuning boxes.
Also the tunit boxes threw the obc mpg reading right out, said it was up from 32mpg to 50+ but still doing the same miles per tank.
The spider box gives true mpg readings, but that might be that the E90 measures them differently?
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