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Old September 19th, 2013, 05:33 AM   #1087
Flex Is OverRated
974x4Taco's Avatar
Join Date: 11-19-06
Location: Battle Creek
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Starting mid 09 cummins started using a new boot loader on it's ECM that makes it so it can not be flashed with anything other than stock tuning. I don't fully understand but there is a bunch of info on EFI lives forum.
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