The JB4 is the proven piggyback ECU for Mazda’s 2.5L turbo engines - no flashing, no coding, no VIN lock. Plug in to two engine bay sensors and OBDII CANbus in under 30 minutes.
Up to 40whp & 50wtq on stock 2.5T - verified across CX-5, CX-9, Mazda 3, Mazda 6, CX-30 and CX-50
8 preloaded maps including E85 options and boost-by-gear for sharper traction
Real-time monitoring of 40+ parameters: knock, AFR, timing, trims and more
Built-in safety against overboost, knock and lean conditions - daily driver or track day capable
Rugged billet aluminium housing, USA designed and assembled, 5-year warranty
