The JB4 is the unquestioned king of N5x performance, features, and value. But when it comes time to add larger then OEM turbos or more than 50% E85, we've specially engineered a back end DME flash to help the JB4 take things to the next level. The flash map includes updates to the ignition advance maps, fuel maps, VANOS maps, and other changes intended to improve the JB4's functionality, performance, and adjustment range in ultra high performance applications.
For N54 motors this back end flash can be either be loaded for free using the BimmerBoost flash software here or via a Cobb V3 flashing tool. Our N55 flash (covers 2011-early 2012 models) can only be loaded with the Cobb V3.
In addition to loading our JB4 back end flash maps these include Cobb's full lineup of off the shelf maps.