F Chassis N55 BMW JB4 Tuner Choose your vehicle:JB4_F10_A Don't let weak and unresponsive

Don't let weak and unresponsive factory gas pedal mapping ruin your driving experience

The BMS OCC retains the factory fully closed loop PCV operation preventing any PCV vapor from leaking to the atmosphere

Click here for the latest JB4 firmware

these kits will be built after the order is placed and will ship in 5-7 business days

A new E85 compatible Walbro pump

F Chassis N55 BMW JB4 Tuner Choose your vehicle:JB4_F10_A Don't let weak and unresponsivePower gains of up to 80HP on a stock vehicle without the risks of flashing! Ready to take your F chassis N55 BMW to the next level? How about up to 60hp to the wheels (80hp crank) on a completely stock car or up to 100hp to the wheels (120hp crank) on a fully modified car? The JB4 features a simple plug and play installation harness for easy installation and includes many features not found on any other tune. Including the ability to enable disable