Up to 75hp with no ECU flash — the most advanced plug-and-play tune for your Tundra.
The Gold Standard in Plug-and-Play Tuning
The JB4 is the most advanced and highly-featured tuning system available for your 2022-Present Toyota Tundra 3.4L. Power gains are up to 60hp to the wheels (75hp crank) on a completely stock truck on pump gas — and even higher with bolt-on parts, higher octane, E85 mixtures, or larger turbos.
No ECU flash needed, and it's compatible with locked ECUs. The JB4 installs between your truck's sensors and the ECU, manipulating boost, timing, and fueling in real time — a similar effect to an ECU reflash, but without the vehicle ever knowing it's been tuned and without unlocking or flagging your ECU.
JB4 PRO Bluetooth — Included
Our all-new JB4 PRO smartphone connection is included, wirelessly linking the JB4 to your Bluetooth iOS or Android device. Record and analyze vehicle data, switch performance maps, and update JB4 firmware as we release free newer versions with more powerful maps and new features. The adapter fits fully inside the JB4 enclosure for weather protection and a clean look, and the JB4PRO app includes advanced log-analysis tools to estimate performance and flag any tuning concerns.
JB4 Features & Benefits
Up to 60hp to the wheels on a stock vehicle (75 crank)
Improves 0-60 and quarter-mile times
Multiple tuning maps for different fuel types, including E85 support
On-the-fly in-dash map switching & boost-by-gear traction control
Reads and deletes fault codes; logs up to 40 engine parameters
Full CANbus integration; runs as smoothly as stock, no fuel-economy hit in normal driving
Not VIN-locked and fully removable; billet aluminum enclosure; 5-year warranty
Designed and assembled in the USA
Dyno Results
Real dyno-proven gains of up to 60hp to the wheels / 75hp at the crank on an otherwise stock Tundra.
See It in Action
Toyota Tundra Before & After JB4
Hear and feel the difference the JB4 makes on a Gen 3 Tundra. Simple to install, fully reversible, and it transforms the throttle response and pull without touching your factory ECU.
• 2022+ Toyota Tundra 3.4L V6 Twin Turbo • 2022+ Toyota Tundra 3.4L V6 Hybrid Twin Turbo
Select your engine (gas or hybrid) above. Requires 91 octane or better for performance gains.
FAQ
Do I need to flash my ECU? No. The JB4 is a piggyback tune that works alongside your factory ECU — even locked ones — so nothing is modified or flagged.
Is it removable? Yes. It's plug-and-play, not VIN-locked, and can be removed or moved to another vehicle at any time.
Does it hurt fuel economy? No impact during normal driving. Performance gains require 91 octane or better.
Gas vs. hybrid — which do I pick? Choose the variant that matches your engine: 3.4L V6 Twin Turbo (gas) or 3.4L V6 Hybrid Twin Turbo. Both make the same JB4 gains.
Is the Bluetooth adapter included? Yes — the JB4 PRO wireless adapter is included for data logging, map switching, and free firmware updates.
What's the warranty? The JB4 carries a 5-year warranty and is designed and assembled in the USA.
