SKU: 7650054751

JB4 Tuner for 2021+ Toyota GR Yaris & GR Corolla 3cyl - Burger Tuning

Sale price$269.55 Regular price$299.50
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Ships within 48 hours · Estimated delivery Aug 17 - Aug 22

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Description

JB4 Tuner for 2021+ Toyota GR Yaris & GR Corolla 3cyl - Burger TuningPower gains of up to 50whp and 60wtq to the wheels on a stock vehicle without the risks associated with flashing! The JB4 is a plug and play performance tuner that attaches to two easy to access sensors in the engine bay and works with your factory DME 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

Power gains of up to 50whp and 60wtq to the wheels on a stock vehicle without the risks associated with flashing!

The JB4 is a plug and play performance tuner that attaches to two easy to access sensors in the engine bay and works with your factory DME 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. Now includes the JB4PRO adapter and free app built in!

JB4 Installation is very discrete and it quickly removes without a trace when needed. Fuel economy during normal driving is unchanged. Compatible with all driving modes. Does NOT require flashing the ECU!

The system is fully CANbus equipped allowing the tuning to take in advanced engine data for mapping, logging, and diagnostics. Data channels include boost, timing, air/fuel, fuel trims, throttle, knock control, and much more! Made in the USA. 5-Year warranty.

Wirelessly Connect to your JB4: Our all-new JB4 PRO smartphone connection is included to wirelessly connect the JB4 tuner to your Bluetooth 4.0 compatible iOS or Android device. This option allows 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. Our new adapter fits fully inside the JB4 enclosure for enhanced weather protection and a more streamlined look. The JB4PRO Free app features an intuitive easy-to-use interface, help buttons, and advanced log analysis tools that can estimate the performance of your car and help identify any tuning concerns.

For more information about the JB4PRO mobile app click here.


JB4 Features and Benefits

• Power gains of up to 50whp and 460wtq to the wheels on a stock vehicle
• Improves 0-60 times and 1/4 mile times
• Preloaded with custom JB4 Toyota GR Yaris/GR Corolla 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 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
• 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
• 5-year extended warranty

Vehicle Fitment

Toyota 
• 2021-Present Toyota GR Yaris Turbocharged 3cyl
• 2023-Present Toyota GR Corolla Turbocharged 3cyl

What is a JB4?

The JB4 is a plug & play tune available for turbocharged vehicles. The JB4 tuner installs between your car's sensors and its 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 & 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 be 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 and is sold in over 67 countries worldwide.

Is the JB4 a real tune?

Yes the JB4 is a real tune. By tapping into specific sensors and CANbus for real time vehicle data the JB4 is able to alter your boost, timing, AFR, and/or fuel trims, to a similar degree an ECU reflash would, but without the vehicle ever knowing its been tuned. The result is safe, smooth, and significant power and torque gains while retaining your factory safety systems and without having to unlock/flag your ECU.

Toyota GR Yaris JB4 Install Video

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 7650054751

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4.7 ★★★★★
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Verified Purchase
gls or sewnserge
Chelsea, US
★★★★★ 5
Works great.
Size: 84 Count (Pack of 1)
Like the tablets much more than the powder, but need to take 3 fairly large tablets. If I could remember to take it 3 times a day, it wouldn't be bad, but I take 3 all together. A little hard to get down.
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Reviewed in the United States on January 10, 2025
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Verified Purchase
Anthony m.
Grantham, US
★★★★★ 3
They go fast
Size: 84 Count (Pack of 1)
Ok
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 2, 2026
J
jennifer
Omaha, US
★★★★★ 5
Easy tasty way to support digestive health
PSA- You need more fiber. I've been using these prebiotic fiber gummies for a while now, and overall I've had a very positive experience. The Citrus Berry Splash flavor is genuinely enjoyable, which makes them much easier to take consistently than some other fiber supplements I've tried. I also love the convenience I keep the bottle on my coffee table and have them after dinner when I watch TV. I've noticed that they help support regularity when taken consistently, and I like knowing that they contain prebiotic fiber to help nourish beneficial gut bacteria. For me, these gummies work best as part of an ongoing digestive health routine rather than as a quick solution when I'm already feeling backed up. In those situations, I personally find fiber powders to be a bit more effective. However, that's not really the purpose of these gummies—they're designed to help maintain digestive health and regularity over time, and I think they do that well. The gummies tend to stick together in the bottle, especially once I've gotten about halfway through it. I've found that storing the bottle upside down helps prevent them from clumping too much and makes them easier to grab. Overall, these are a great option if you're looking for a tasty, convenient fiber supplement that's easy to stick with long term. They've helped me maintain regularity, taste great, and are much easier to incorporate into a busy schedule than many other fiber products. I would definitely purchase them again.
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Reviewed in the United States on June 1, 2026
T
Tricia H.
Louisville, US
★★★★★ 5
Delicious and easy to chew probiotic gummies that also add fiber to your diet!
i just received this package of probiotic fiber gummies and can assure you that they taste terrific! The container is easy to open and includes an internal seal both to assure freshness and the safety of the product. These are individual gummies that are easy to chew and taste yummy! One flavor is citrusy and another has a berry flavor. Chewing them was not at all difficult and I did not feel like I ended up with lots of residual product stuck in my teeth. Each serving of 3 gummies provides 6 grams of fiber which is an additional benefit to the probiotics! The recommended dose is 3-6 gummies per day. As well as being flavorful and easy to chew, the addition of fiber is a great benefit for most people’s diets! I am a healthy woman of “a certain age” as the French say. I don’t have specific health problems that I know of but I am trying in general to maintain a healthy lifestyle. That was my goal in acquiring this product. This is the first day I have eaten and enjoyed these probiotic gummies. Of course I have not experienced any health benefits yet but my initial experience eating these soft gummies has been extremely positive! If you are interested in adding probiotics or fiber to your diet, I encourage you to purchase these inexpensive, delicious and easy to chew gummies!
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Reviewed in the United States on May 13, 2026
J
JReader
Boise, US
★★★★★ 5
Tastes Great!
I’ve tried a lot of fiber supplements over the years, and these are honestly one of the easiest ones to stick with consistently. The biggest thing for me is that they actually taste good. The Citrus Berry Splash flavor is pleasant without being overly sweet or having that weird artificial vitamin aftertaste some gummies have. They’re soft and easy to chew too. Some fiber gummies can be oddly hard or stick to your teeth, but these have a good texture and are easy to take daily. What I really appreciate is the convenience. It’s so much easier for me to remember gummies than mixing powders into drinks all the time. I can just take them quickly in the morning or after dinner and be done with it. After using them consistently, I’ve noticed they help keep things more regular without feeling harsh or causing the kind of stomach discomfort some fiber products can. They feel gentler compared to a lot of other options I’ve tried. The large bottle is another plus. With 126 gummies, it lasts quite a while, so even though the upfront cost might seem a little high, I think the value is pretty reasonable for how long they last. I also like that they’re a simple way to add a little extra support to my routine, especially on days where my diet probably isn’t perfect. Overall, easy to take, good flavor, gentle on the stomach, and something I’ll continue buying.
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Reviewed in the United States on May 11, 2026

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