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I'm sure if they dump log data from the DME, they'd see abnormally high fuel trim numbers as well as flow rates near/at the fuel cap limit.
Piggybacks are a lot "safer" for warranty since they don't monkey with the DME, but if BMW was dealing with an engine/driveline claim, I'm sure the data they pull will point very heavily to an aftermarket piggyback.
Like said above, you gotta pay to play....
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