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The real problem is if you have a catastrophic failure with your tuned ECM installed, then you have to pull it and replace it with the factory ECM. But now the factory ECM has had zero starts on it. When you get towed into the dealer and they download the history and diagnostics from your factory ECM, it has nothing to tell them. This may or may not set off warning flags.
I dont understand the scenario where you would change out the ECM unless or until you had a catastrophic failure of some sort and if you do you have the above challenge.
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