2015+ M3/M4 S55 JB4
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2015+ M3/M4 S55 JB4

$799.00
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2015+ M3/M4 S55 JB4 Ready to take your turbo //M vehicle to the next level? The ultimate tune for your S55 powered vehicle, the JB4 allows you to go from factory stock to full race, and everywhere in between, with the push of a button on your steering wheel. The JB4 installs and removes easily and includes many unique features not found in any other tune including user adjustable 1st and 2nd gear boost limiting, map switching in dash, electronic wastegate control, ethanol fuel support, and built in advanced CANbus based diagnostic tools. Installation is completely removable with no splicing or cutting of factory wires. For the latest performance results, updates, firmware, and map guide be sure to visit N54tech.com. JB4 Map GuideMap 0: Disable JB4 / Full Pass Through Mode Map 1: Stage1 map adding approximately 40whp and 40wtq across the power band on pump gas. Suitable for all stages and fuel mixtures. Map 2: Slightly more aggressive version of map 1 intended

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