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Sandager Sandager is offline
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Join Date: Jun 2019
Car: E92 335i
Question JB4 on already ecu tuned car - conflict? - 06-27-2019, 03:42 AM


I have a car that is already ecu tuned. I made some more mods to the car, and bouhgt a JB4. My question is, will the JB4 overwrite whatever tune is made before? Or does it conflict in any way? Do i need to get it back to stock ecu before putting on the JB4?
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steve70 steve70 is offline
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Car: 08 335ix
Default 07-16-2019, 12:01 AM

does any one know where the thick yellow wire goes please
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