Power gains of up to 60hp and 80tq to the wheels on a stock vehicle, and up to 100hp to the wheels on CT4-V Blackwing models.

From Luxury to Lethal. This plug-and-play tuner connects to easy-to-access sensors in the engine bay and works with your factory ECU to optimize boost, timing, and fueling for maximum performance and reduced turbo lag.

Installation is very discreet. Unlike flash remaps that cannot be fully removed, the JB4 leaves no trace and the vehicle is never aware it is producing higher boost or power levels. Fuel economy during normal driving is unchanged and it remains compatible with all driving modes.

Unlike less advanced tuning systems, the JB4 features full CANbus integration, allowing it to read critical engine data directly from the ECU for real-time tuning adjustments. This includes pedal position, throttle position, timing advance, fuel trims, air/fuel ratio, knock feedback, gear, and more. Systems without CANbus cannot monitor or incorporate this data, limiting both performance and safety. With CANbus, the JB4 delivers large power gains with smooth and precise power delivery.

JB4 includes multiple maps for 91 octane, 93 octane, stock mode, VALET mode, E85 mixtures, and unleaded race fuel. It also offers boost-by-gear control for improved launches, the ability to read and delete fault codes, and extensive customization. The JB4 is made in the USA and backed by a 5-year warranty.

Optional JB4 Harness Extensions: These plug-and-play connectors simplify installation and removal by bypassing the difficult-to-reach lower MAP sensor. Sold in pairs. Available here.

Optional Boost Control Module (BCM): Available for JB4-tuned 2022+ CT4-V Blackwing 3.6L Twin Turbo V6 engines. Available here.

Wirelessly Connect to your JB4: Our all-new JB4 PRO smartphone connection is included to wirelessly connect the JB4 tuner to your Bluetooth 4.0 compatible iOS or Android device. This option allows you to record and analyze vehicle and tuning data, change JB4 performance maps, and update JB4 firmware as we release free newer versions with updates, more powerful maps, and new features under development. Our new adapter fits fully inside the JB4 enclosure for enhanced weather protection and a more streamlined look. The JB4PRO Free app features an intuitive easy-to-use interface, help buttons, and advanced log analysis tools that can estimate the performance of your car and help identify any tuning concerns.

For more information about the JB4PRO mobile app click here.

JB4 Power Gains, Features & Benefits

• Power gains up to 60hp and 80tq to the wheels on a stock vehicle, and up to 100hp on CT4-V Blackwing
• Improves 0-60 and quarter mile times.
• Includes multiple tuning maps for different fuel types.
• Quick plug and play installation.
• Supports E85 ethanol blends.
• Reads and deletes fault codes.
• Displays and logs up to 40 engine parameters.
• Boost by gear control for improved traction.
• Controls exhaust flap operation on supported vehicles.
• Compatible with the free JB4PRO app.
• Offers better performance and safety than basic chip tunes.
• Full CANbus integration.
• Runs as smoothly as stock.
• Compatible with all driving modes.
• No impact on fuel economy during normal driving.
• Requires 91 octane or better for performance gains.
• Not VIN locked and fully removable.
• Includes billet aluminum enclosure.
• Designed and assembled in the USA.
• 5-year warranty.

JB4 Vehicle Fitment

Available for Luxury, Premium Luxury, Sport, V-Series models, and CT4-V Blackwing.

Cadillac
• 2020+ Cadillac CT4 2.0L Turbo I4
• 2019+ Cadillac XT4 2.0L Turbo I4
• 2019+ Cadillac XT5 2.0L Turbo I4
• 2021-2025 Cadillac XT6 2.0L Turbo I4
• 2020+ Cadillac CT4-V 2.7L Dual Volute Turbo I4
• 2020+ Cadillac CT4-V Blackwing 3.6L Twin Turbo V6
• 2020+ Cadillac CT5 2.0L Twin-scroll Turbocharged I4
• 2020+ Cadillac CT5-V 3.0L Twin Turbo V6
• 2020+ Cadillac CT5 550T 3.0L Twin Turbo V6

What is a JB4?
The JB4 is a plug-and-play performance tune for turbocharged vehicles. It installs between your vehicle’s sensors and ECU to safely increase boost and optimize performance. With advanced CANbus integration, fuel and spark control, Bluetooth connectivity, and ongoing free firmware updates, the JB4 delivers more performance and functionality than traditional piggyback tuners. The JB4 is not VIN-locked, so it can be removed, transferred to another vehicle, or resold later.

Is the JB4 a real tune?
Yes. By tapping into engine sensors and CANbus data in real time, the JB4 can adjust boost, timing, AFR, and fuel trims similar to an ECU reflash, while retaining factory safety systems and avoiding ECU unlocking or flash flags.

JB4 Install Video

Cadillac CT4 2.0T JB4 dyno results

2021 CT4 2.0T dyno results

Cadillac CT4 dyno chart

Cadillac CT4 CT5 dyno testing

Burger Motorsports JB4 tuned 2024 Cadillac CT4-V Blackwing

Cadillac CT4-V Blackwing JB4 tuned

Cadillac CT4-V Blackwing

Tapout Tuning picked up 80whp+ on 93 octane testing their 2022+ Cadillac CT4-V Blackwing JB4. More to come.

Cadillac CT4-V Blackwing dyno results

Cadillac CT5-V Dyno

Cadillac CT5-V dyno results

2021 CT5-V, JB4, 93 octane

Cadillac CT5-V JB4 dyno

Cadillac

Boost Control Module (BCM) for JB4 Tuned Vehicles

JB4 for 2019+ Cadillac

Cadillac/GM JB4 MAP Sensor Bypass Extensions