I talked to my service manager last week. He said the recall is purely to enable the OBD port to properly talk to emissions testing equipment. There are absolutely no changes made to the engine or trans parameters. He told me that there was no rush to get it in for the flash until I get my Illinois emissions test notice.

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'04 E53, 4.4 Sport
'97 E39 528i
'86 911 Carrera, track car
'96 BMW R1100R