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Service number 12597121 is 2007 ECM. 2008 ECM service number is 12612384. So you can not flash 2008 OS to 2007 ECM. What you can do is use 2007 Corvette manual OS. OS change on E38 ECM can not be...

How do I know which side of the torque model I should modify? Or should I usually make same adjustments to map and airmass side? I have seen someone modify the EQ ratio coefficient too. Is it...

I have the 2 bar OS so it is not the reason. With newer E38 I can scale spark table airmass, get integrator delay for better O2 adjustment and there is more parameters to log for idle tuning etc.
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I'm not 100% sure about anything before I have tested it by myself. But I have been told that it will work and it been done many times so I'm willing to try. I will report how it went :)

And I...

You are right. Question is what year VIN to use. I checked some VIN and OS seems to be different 2010-2013.

I'm swapping 2010+ ECM to my 2006 A6 Corvette. Is there some OS that is considered best OS to use? Or are all 2010-2013 Corvette OS so similar that it doesn't matter what to use?

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I have a 2006 C6 with T43 OS 24237276. I checked tis2web and there is newer calibration available than I currently have in my car. I have tune file from other car with newer calibration. Can I just...