JB4

If you're running E85 or ethanol mixes in your S55 BMW, you need this kit! Know your exact ethanol content in real-time via the Fuel-It! or JB4 app on your smartphone or tablet. This is a complete...

JB4 Group 4 The JB4 is a true user adjustable plug and play solution for Gen3 Jetta GLI and Turbo Beetle. Power Gains: Starting at 55bhp and 60ft-lb with 91 octane/95Ron with + 4.0 psi boost over...

The JB4 Wireless Bluetooth Connect Kit (Rev 3.7) allows your Bluetooth 4.0 compatible Apple® iOS® and Android® devices to connect wirelessly to your JB4 via the JB4 app. View critical...

Power gains of up to 75hp on a stock vehicle without the risks of flashing! The JB4 is the most advanced and highly featured tuning system available for your 2022-Present Toyota Tundra 3.4L. Power...

Power gains of up to 100hp and 100tq to the wheels on a stock vehicle The JB4 is a plug and play Kia / Hyundai / Genesis tuner that plugs into easy to access sensors in the engine bay and works...

eplacement JB4 OBDII cable suitable for use in all applications where the JB4 attaches to the OBDII port under the dash. Also available with a "molex" JB4 side connection for systems requiring repair.

Power gains of up to 100hp and 120tq to the wheels on a stock Infiniti Q50/Q60 3.0T The JB4 Tuner for Infiniti Q50/Q60 3.0T plug and play tuner attaches to two easy to access sensors in the...

Power gains of up to 100hp and 120tq to the wheels on a stock Nissan Z The JB4 performance tuner for the new 2023+ Nissan Z is plug and play and attaches to two easy-to-access sensors in...

Power gains of up to 40whp and 40wtq on a factory vehicle without the risks of flashing! The JB4 is a plug and play tuner that attaches to two easy to access sensors in the engine bay and works...

Power gains of up to 100hp and 100tq to the wheels on a stock vehicleThe JB4 is a plug and play Kia / Hyundai tuner that plugs into easy to access sensors in the engine bay and works with your...

Power 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...

Power gains of up to 100hp on a stock vehicle without the risks of flashing! Units shipped 3/5/2021 or later include a free electronic wastegate (EWG) connector preinstalled in the JB4 harness! The...

Power gains of up to 50whp and 60wtq to the wheels on a stock vehicle without the risks associated with flashing! The JB4 is a plug and play performance tuner that attaches to two easy to access...

Power gains of up to 40hp and 50tq to the wheels on a stock vehicle without the risks associated with flashing!This plug and play tuner attaches to two easy to access sensors in the engine bay and...

Power gains of up to 40whp and 50wtq on a factory vehicle This plug and play tuner attaches to two easy-to-access sensors in the engine bay and works with your factory ECU tuning to remap your boost,...