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      10-13-2020, 10:35 PM   #28
DriveM550i
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Drives: 2018 BMW M550i
Join Date: Oct 2020
Location: Schaumburg, IL

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Quote:
Originally Posted by MLIFEM550 View Post
No I was going to but found out that it will leave imprint in your ecm therefore void your warranty. I talked to my SA on Saturday I prolly do jb4 which's is a Piggyback system and it could be removed without leaving anything in your ECM if something goes wrong.
What kind of numbers is JB4 supposed to put out? Anything else interesting you could share about that tune?
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