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JB4 Tuner - 1.6T, 2.5T, 3.5T, SmartStream, & K5


RIDICULOUSLY FAST SHIPPING! We ship the same day you order. Often within the hour!

Power gains of up to 100hp and 100tq to the wheels on a stock vehicle

The JB4 is a plug and play tuner for Hyundai, Genesis and Kia vehicles that plugs into easy to access sensors in the engine bay and works with your factory ECU tuning to remap your boost, timing, and fueling for optimal performance and reduced turbo lag. It features a 64mhz processor allowing sensors to be sampled 800 times per second using dedicated 10 bit digital to analog converters, ensuring smooth and powerful performance. It's able to auto-detect between 1.6L and 2.5L turbo engines automatically allowing for simple plug and play installation across the entire Kia / Hyundai turbocharged lineup!

Click here for the JB4 Tuner for 3.3TT, 2.0T, 1.6T and 2.4T engines

Unlike other tuning systems the JB4 includes a fully programmable CANbus system, upgradable firmware, and data logging capability. CANbus allows the JB4 to take into account pedal input, throttle position, gear, engine speed, air/fuel ratio, fuel trims, ignition advance, knock, and many other factors and incorporate those into the performance mapping. It can also read/delete fault codes, includes unique safety features such as keeping boost pressure low until oil and water is up to temperature to provide proper engine and turbo lucubration and drop to a low boost map if the engine starts to overheat, run lean, excessively knock, or over boost. 

The JB4 offers a lot more performance, functionality, and safety than your average performance chip.

The default JB4 map 1 runs 4psi over stock peak and tuned maps including stock and valet mode can be selected on the fly using a BMS diagnostics cable or JB4 mobile smartphone adapter.

Installation is very discrete and it quickly removes without a trace when needed. Includes maps for 91 octane, 93 octane, and E85 (ethanol fuel) mixtures. Fuel economy during normal driving is unchanged. Compatible with all driving modes. Made in the USA. 5 year warranty.

NOTE: This BETA system includes retrofit MAP connectors. The retrofit connectors do not have the usual retaining clips and instead are secured by friction and/or included zip-ties. Once we are able to source the correct connectors with retaining clips they will be provided to BETA customers free of charge.

Wirelessly connect the JB4 to your Bluetooth 4.0 compatible iOS and Android device via the JB4 Mobile connect kit, or to your Windows laptop with the BMS data cable. Both options allow you 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. Separate JB4 Mobile app purchase also required.

Kia / Hyundai JB4 Features and Benefits

• Power gains of up to 100hp and 100tq to the wheels on a stock vehicle
• Improves 0-60 times and 1/4 mile times
• Preloaded with custom JB4 Kia/Hyundai tuning software and up to 8 maps for various fuel and modification levels
• Ethanol (E85) compatible tuning maps
• Able to read/delete fault codes
• View and record up to 40 different gauges/engine parameters in real-time with the JB4 app.
• Boost by gear in 1st, 2nd, and 3rd can be controlled via the JB4 app for a perfect launch
• Exhaust flap operation can be controlled in most JB4 applications
• Compatible with JB4 Mobile for smartphone logging, tuning changes, and adjustment
• The JB4 offers a lot more performance, functionality, and safety than your average performance chip
• Quick Plug & Play Installation
• CANbus OBDII integration offering unrivaled tuning features and performance
• Improved performance over non-integrated chip tunes
• Runs as smoothly as stock, this is how your vehicle should have come from the factory
• Compatible with all driving modes
• Fuel economy unchanged during normal driving
• 91 octane fuel or better required for performance gains
• Not VIN locked and can be removed without a trace and resold down the road
• Includes the rugged JB4 billet aluminum enclosure for protection
• Made in the USA
• Free USA Shipping
• 5 year warranty


• 2020+ Kia Stinger 2.5t
• 2020+ Kia Sorento 2.5t
• 2020+ Kia K5 1.6t 2.5t
* 2021+ Kia Elantra SmartStream 1.6t
* 2021+ Kia K8 3.5t

• 2020+ Hyundai Santa Fe 2.5t
• 2020+ Hyundai Sonata 2.5t
• 2021+ Hyundai Staria 3.5t
• 2022+ Hyundai Santa Cruz 2.5t 

• 2020+ Genesis G80 2.5t
• 2020+ Genesis GV70 2.5t and 3.5tt
• 2020+ Genesis GV80 2.5t and 3.5tt

Click here for previous KIA/Hyundai/Genesis models

What is a JB4? The JB4 is a plug and play tune available for turbocharged vehicles. The JB4 tuner installs between your car's sensors and the DME/ECU (computer) and manipulates vehicle performance through these connections making your vehicle much faster. While it's not the only tuning system that operates this way the JB4 separates itself from the competition with much more advanced connection points and processing, including CANbus, fuel and spark control, Bluetooth to your smartphone, and a variety of innovative and advanced features not possible with any other system. BMS regularly publishes free mapping and firmware updates adding performance and features as ongoing development allows. In addition, the JB4 system is not VIN locked to your vehicle and can quickly removed and swapped between cars or resold at a later time. Often imitated but never duplicated, the JB4 has been the gold standard in plug and play turbocharged performance tuning for over a decade.

JB4 iOS App | JB4 Android App

Click here for frequently asked questions.


By purchasing this item you agree to the JB4 Terms and Conditions


2021 Genesis GV80 2.5L with JB4

2021 KIA K5 1.6L SmartStream

By purchasing this item you agree to the JB4 Terms and Conditions

When I first installed the JB4 tuner, it took me about 45 minutes. Every time after that, about 15 or 20. You don't need to be very mechanically inclined to install the JB4 tuner. It's a great way to add power quickly, easily and inexpensively - especially considering the gains... - Danielle C