Up to +80 whp / +100 hp crank on a stock B58 Supra running pump gas — even more with bolt-ons, E85, or a bigger turbo
No ECU flash — fully compatible with locked 🔒 ECUs
Two versions — the standard JB4 (includes the JB4 PRO Bluetooth adapter & free app) or the upgraded JB4PRO board with built-in Bluetooth, flex-fuel, and fuel-pressure control
Plug & play harness — fast install/removal, fully reversible, not VIN-locked
Full feature set — map switching, boost-by-gear, water/meth, data logging, fault-code read/clear, wastegate & exhaust flapper control
Billet enclosure • Designed & assembled in the USA • 5-year warranty
The most advanced plug-and-play tuning system for the turbocharged A90 / A91 GR Supra — up to 80 whp (100 hp crank) on a completely stock car, with no flash and no risk to your factory ECU.
✅ Which Version Should You Choose?
JB4 ($599) — the right choice for most Supra owners. Standard JB4 board with plenty of power for a stock or bolt-on car on 93 octane. Includes the JB4 PRO Bluetooth smartphone adapter & free app for wireless map switching, logging, and free firmware updates.
JB4PRO Board ($899) — the upgraded control board for serious builds. Adds built-in Bluetooth, integrated flex-fuel & fuel-pressure control, port-injection / WMI support, and onboard logging memory. Choose this if you're running E30/E40+, an upgraded turbo, port injection, or water/methanol.
Real Power, No Flash Required
The JB4 is the most advanced plug-and-play tuning system available for the Supra platform. Power gains of up to 80 horsepower to the wheels (100 hp crank) are possible on a completely stock B58 car running pump gas. Add bolt-ons, higher octane, E85 mixtures, or an upgraded turbo and the gains climb even higher.
Unlike a flash tune, the JB4 needs no staged upgrades or supporting mods — install it as your very first upgrade and immediately feel stronger acceleration, faster turbo response, and smoother power delivery. And because it never touches your ECU, it's fully compatible with locked ECUs.
Wireless Tuning on the Standard JB4
Even the standard JB4 connects to your phone. The included JB4 PRO Bluetooth adapter fits fully inside the JB4 enclosure for weather protection and a clean look, and wirelessly connects to your iOS or Android device. Record and analyze data, switch performance maps on the fly, and pull free firmware updates as BMS releases more powerful maps and new features.
The JB4PRO Free app adds an intuitive interface, help buttons, and advanced log-analysis tools that estimate performance and flag any tuning concerns.
Note: The included adapter is the JB4 PRO smartphone connection — it is not the same as the upgraded JB4PRO control board below.
JB4 vs. JB4PRO Board — What's the Difference?
Feature
JB4
JB4PRO Board
Pump-gas power & map switching
✅
✅
Data logging
✅
✅ + onboard memory
Bluetooth
Included adapter
Built in
Flex-fuel integration
Add-on hardware
Built in
Fuel-pressure control
Limited
Enhanced
Port injection / WMI
External hardware
Integrated
Best for
Stock / bolt-on 93-oct builds
E30+, big turbo, port inj / WMI
For a mostly stock Supra chasing a simple plug-in power bump on 93 octane, the standard JB4 is plenty. Step up to the JB4PRO board if you're building toward higher ethanol content or a serious fuel system.
Advanced Tuning, Built In
Dyno Results — Stock vs. JB4
2020+ Toyota GR Supra B58 — factory tuning vs. JB4. Click to enlarge.
Easy Plug-and-Play Install
The JB4 harness plugs into accessible engine-bay connectors — fast to install, fast to remove, and completely reversible. Watch the full Supra Mk5 install, then grab the B58 install guide (PDF).
Note: In-dash commands are not yet developed for the Supra JB4.
A Decade of Proven Tuning
The JB4 has been the gold standard in plug-and-play turbocharged tuning for over a decade, sold in 67+ countries. Often imitated, never duplicated — with more advanced connection points, full CANbus integration, fuel & spark control, and Bluetooth logging no other piggyback can match.
FAQ
Which Supra does this fit? 2020-2026 Toyota GR Supra Mk5 (A90 / A91) with the turbocharged B58 inline-six.
Do I need to flash my ECU? No. The JB4 requires no ECU flash and is fully compatible with locked ECUs — real gains without unlocking or flagging your ECU.
What's the difference between JB4 and JB4PRO? The standard JB4 includes the JB4 PRO Bluetooth smartphone adapter and is plenty for a stock or bolt-on 93-octane Supra. The JB4PRO board is an upgraded control board with built-in Bluetooth, integrated flex-fuel & fuel-pressure control, port-injection / WMI support, and onboard logging — the better choice for E30+, big-turbo, or serious fuel-system builds.
Does the standard JB4 have Bluetooth? Yes — it includes the JB4 PRO Bluetooth adapter and free app for wireless map switching, logging, and firmware updates. The JB4PRO board simply builds Bluetooth into the hardware along with the added fuel-system features.
What octane do I need? Pump gas works for the base gains. Higher octane, E85 blends, and race fuel unlock the more aggressive maps.
Is it reversible? Completely. The JB4 is not VIN-locked — remove it any time, swap it between vehicles, or resell it later.
What's the warranty? 5 years from Burger Motorsports. Designed and assembled in the USA.
Which should I buy? For most stock or lightly-modded Supras on 93 octane, the standard JB4 is all you need. Go JB4PRO board if you're planning E30+, an upgraded turbo, port injection, or water/methanol.
