The JB4 is the proven, no-nonsense N54 tuning solution for E90, E92, E82 and other N54 chassis - including 135i, 335i, 1M, 535i, X6 xDrive35i and Z4 sDrive35i.
Up to 100hp and 100lb-ft at the wheels on pump fuel - scalable with mods
Fully plug-and-play: no coding, no dealer visits, no laptop needed
Included harness + preloaded maps for pump, E85, race fuel and methanol
JB4 Mobile app control: live tuning, data logging, map switching, valet mode
Not VIN-locked; transferable between N54 cars - 5-year warranty, made in USA
