Description
The Burger Tuning JB4 for Subaru’s 2.4L turbocharged 4-cylinder engine delivers up to 50 wheel horsepower (70hp at the crank) on a stock vehicle with pump gas, and even more with ethanol blends or bolt-on upgrades.
Designed as the most advanced plug & play Subaru tuner available, the JB4 works alongside your factory ECU to optimize boost, timing, and fueling for maximum performance without sacrificing drivability.
With CANbus OBDII integration, the JB4 reads real-time engine data—including throttle position, timing advance, air/fuel ratios, knock feedback, and fuel trims—allowing for dynamic tuning and advanced safety features. You can switch between up to 8 maps on the fly, including stock mode, performance maps, and ethanol tuning options.
Installation is quick and fully reversible, with no ECU flashing required. The JB4 is not VIN-locked and can be transferred between compatible vehicles or resold later.
Features & Benefits
- Power gains of up to 50whp on a stock vehicle
- Improves 0–60 mph and 1/4 mile performance
- Preloaded with custom Subaru-specific tuning software and up to 8 adjustable maps
- Ethanol (E85) compatible tuning maps
- On-the-fly map switching via smartphone or tablet
- View & record up to 30 live gauges/parameters with the JB4 app
- Boost-by-gear control for better traction and launches
- Read & delete diagnostic fault codes via the app
- Advanced safety protocols using CANbus data
- Quick Plug & Play installation – no ECU flash required
- Maintains stock drivability and fuel economy during normal driving
- Compatible with all factory driving modes
- Not VIN locked – transferable between vehicles
- Rugged billet aluminum JB4 enclosure included
- Made in the USA with a 5-year warranty
Vehicle Fitment
- 2022+ Subaru WRX 2.4L Turbo
- 2019+ Subaru Ascent 2.4L Turbo
- 2020+ Subaru Legacy XT 2.4L Turbo
- 2020+ Subaru Outback XT 2.4L Turbo
What is a JB4?
The JB4 is the gold standard in plug & play turbo tuning, used worldwide for over a decade. It installs between your vehicle’s sensors and ECU, intercepting and optimizing performance parameters in real time.
Unlike basic piggyback chips, the JB4 integrates directly with your vehicle’s CANbus system for precise fuel and spark control, plus Bluetooth smartphone connectivity for live monitoring, data logging, and firmware updates. Burger Motorsports provides free updates with new maps, features, and performance improvements.
