JB4 Tuner for 2025+ Toyota 4Runner 2.4L Turbo

Power gains of up to 75hp on a stock 4Runner!

The JB4 PRO is the newest, most advanced and highly featured tuning system available for your 2025-Present Toyota 4Runner 2.4L. Power gains are up to60hp to the wheels (75hp crank) on a completely stock car on pump gas, gains with bolt-on parts, higher octane, E85 mixtures are even higher.

The JB4 features a simple plug and play installation harness for easy installation & removal and includes many features not found with any other 4Runner tune. Including on the fly in dash map switching between factory and various performance maps, boost limiting by gear for improved traction in lower gears, built-in data logging, built-in code reading, and much more.

Remember the JB4 Toyota 4Runner tuner does not require any additional modifications! Simply install the JB4 as your first and only modification and enjoy an entirely new fast and smooth racing experience. Compatible with both standard gas and i-FORCE MAX Hybrid 2.4T (T24A-FTS) engines.

Includes the JB4PRO app!Wirelessly connect the JB4 to your iOS or Android device 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.

The JB4PRO 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. More information on the JB4PRO app is available here.

JB4 Features and Benefits

Power gains of up to 60HP to the wheels on a stock vehicle
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.
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