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Jb4 worth it.
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09-15-2020, 11:59 AM
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Fuel-It!
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Drives: M4, M5, M2C, X4M, 440i, etc...
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The JB4 is the go-to tune for any car that is leased or under warranty. Can't do quite as much as a full ECU tune but gets you close and offers a lot of great features too like CANflap, boost by gear, on the fly map changes, E85 support, and others.
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