JB4 Tuner for 2020-2026 Toyota Supra Mk5 A90/A91

Power gains of up to 100hp on a stock vehicle without the risks of flashing!

The JB4 is the most advanced and highly featured tuning system for your Toyota Supra Mk5. Power gains are up to 80hp to the wheels (100hp crank) on a completely stock car on pump gas for a B58. Gains with bolt-on parts, higher octane, E85 mixtures, and larger turbos are even higher.

No ECU flash needed and compatible with locked 🔒 ECUs

The JB4 features a simple plug and play installation harness for easy installation & removal and includes many features not found with any other tune. Including on-the-fly in-dash map switching between factory and various performance maps, optional in-dash gauge displays for boost, boost limiting by gear for improved traction in lower gears, progressive water/methanol support, built-in data logging, built-in code reading, optional direct EWG control to prevent throttle closure with exhaust modifications, exhaust flapper control, and much more. Other more expensive tuners may claim to equal the JB4's technology but, upon closer examination, lack most if not all of the JB4's features.

Remember the JB4 does not require any additional modifications or previous stages. Simply install it as your first and only modification and enjoy an entirely new, fast, and smooth racing experience. The JB4 also does not require any user setup or customization, but for those who are interested in changing maps, logging, customization, and loading new features as we add them, we suggest adding one of our Bluetooth phone adapters!