SKU: 60996565278

JB4 for BMW GEN1 & GEN2 B58

$377.37 $419.30
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Ships within 48 hours · Estimated delivery Aug 8 - Aug 13

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Description

JB4 for BMW GEN1 & GEN2 B58Power gains of up to 120whp and 120wtq. on a stock vehicle without the risks of flashing! The JB4 is the most advanced and highly featured tuning system available for your B58 powered BMW. Power gains are up to 120hp to the wheels (140hp crank) on a completely stock B58 engine on pump gas, gains with bolt on parts, higher octane, E85 mixtures, and larger turbos are even higher. The JB4 features a simple plug & play installation harness for easy

Power gains of up to 120whp and 120wtq. on a stock vehicle without the risks of flashing!  

The JB4 is the most advanced and highly featured tuning system available for your B58 powered BMW. Power gains are up to 120hp to the wheels (140hp crank) on a completely stock B58 engine on pump gas, gains with bolt-on parts, higher octane, E85 mixtures, and larger turbos are even higher.

The JB4 features a simple plug & play installation harness for easy installation & removal and includes many features not found with any other tune. Including on the fly in-dash map switching between factory and various performance maps, optional in-dash gauge displays for boost, boost limiting by gear for improved traction in lower gears, progressive water/methanol support, built-in data logging, built-in code reading, optional direct EWG control to prevent throttle closure with exhaust modifications, exhaust flapper control, and much more. Other more expensive tuners may claim to equal the JB4's technology but upon closer examination lack most if not all of the JB4's features.

Remember the JB4 does not require any additional modifications or previous stages. Simply install the JB4 as your first and only modification and enjoy an entirely new fast and smooth racing experience. The JB4 also does not require any user setup or customization, but for those who are interested in logging, adding new features as we post them, etc, we suggest the BMS DATA cable or REV3 mobile phone adapter. 

JB4 Map Guide:

Map0: Stock tuning, fully disable JB4
Map1: 3psi over stock added (91 octane)
Map2: 4psi over stock added (91-93 octane)
Map3: 6psi over stock added (93+ octane)
Map4: Absolute target map with peak target of 20psi (93+ and/or 30% E85, EWG connector suggested)
Map5: Absolute target map with peak target of 22psi (30% E85+ fuel, EWG connector suggested)
Map6: Custom tuning map -- see details on JB4tech.com B58 JB4 page
Map7: Progressive WMI map with tuning a function of meth flow and user-defined boost additive. 
Map8: VALET / Low Boost Map

Note for 2018+ G chassis vehicles with the digital dash layout we have not yet added in the JB4 commands to allow in-dash control but will provide those via a free firmware update once developed. Until then a JB4 mobile adapter or BMS data cable is required for any map and setting changes.

This B58 JB4 model is compatible with all GEN1 and GEN2 B58 motors. For the newest B58TU2 GEN3 motor refer to this product page.

JB4_B58 is CARB Approved Under Executive Order (EO) No.D-744-4 for all 2016-2018 BMW 230i, 330i, 430i, 530i, 340i, 440i, 740i, M240i, and X1 applications.

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. A separate JB4 Mobile app purchase is also required.


JB4 Power Gains, Features, & Benefits

• Power gains of up to 120hp to the wheels on a stock vehicle
• Improves 0-60 times and 1/4 mile times
• Preloaded with custom JB4 BMW 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
• Designed and assembled in the USA
• Free USA Shipping
• 5-year warranty

Vehicle Fitment (GEN1 & GEN2 B58)

Note: If your BMW has a GEN1 OR GEN2 B58 engine and you don't see your exact model on the list below please email us. For the newest B58TU2 GEN3 motor refer to this product page.

BMW 1 Series
• 2016-2019 F20 F21 GEN1 B58 BMW M140i

BMW 2 Series
• 2022+ G42 GEN2 B58 BMW M240i including xDrive
• 2016-2021 F22 F23 GEN1 B58 BMW M240i including xDrive

BMW 3 Series
• 2020-2024 G20 G21 GEN2 B58 BMW M340i including xDrive
• 2016-2018 F30 GEN1 B58 BMW 340i including xDrive

BMW 4 Series
• 2021-2024 G22 G23 G26 GEN2 B58 BMW M440i including Gran Coupe and xDrive 
• 2016-2020 F32 F33 F36 GEN1 B58 BMW 440i including Gran Coupe and xDrive 

BMW 5 Series
• 2017-2023 G30 G31 GEN2 B58 BMW 540i including xDrive

BMW 6 Series
• 2018-2023 G32 G33 GEN2 B58 BMW 640i including xDrive

BMW 7 Series
• 2016-2022 G11 G12 B58 BMW 740i including xDrive

BMW 8 Series
• 2018+ G15 G14 G16 GEN1 & GEN2 B58 BMW 840i including Gran Coupe and xDrive

BMW X Series
• 2018-2024 G01 B48 B58 BMW X3 2.0i, X3 3.0i, X3 M40i including xDrive
• 2019-2024 G02 B48 B58 BMW X4 2.0i, X4 3.0i, X4 M40i including xDrive
• 2019-2022 G05 B58 BMW X5 40i including xDrive
• 2020-2023 G06 B58 X6 40i xDrive
• 2019-2022 G07 B58 BMW X7 40i including xDrive

BMW Z4
• 2019+ G29 B58 BMW Z4 M40

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 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 & 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.

California Customers -- Download the CARB Version Installation Guide

 

 

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: 60996565278

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4.1 ★★★★★
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B
BobCz
Natrona Heights, US
★★★★★ 5
Quality Baking, Not Just For Meat Anymore
Size: 6.0 Qt, Color: Clay, Size: 6.0 Qt, Color: Clay
Since my wife is an avid sourdough baker, requesting this Dutch oven was an easy decision. From the moment I unboxed it, the first thing I noticed was the substantial weight—a testament to its high-quality cast iron core. ​ Beyond its heft, the Dutch oven features a beautifully smooth finish on the interior and exterior that makes it look as good as it performs. My wife has already put it to the test with two loaves of sourdough. While the first loaf browned a bit too much on the bottom, the second attempt turned out absolutely perfect, proving that it just takes a little practice to dial in the heat distribution. ​ I am confident we won’t limit this piece to just bread baking; I can already imagine a delicious chicken or pot roast in its future. If you are looking for a top-tier cooking utensil, you really can’t do much better than this. It is exceptionally well-made and expertly finished. Whether you are a dedicated baker or looking to cook up a perfectly tender roast, you will be doing yourself a favor by adding this Dutch oven to your kitchen collection.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 6, 2026
J
Jody Yoo
Boise, US
★★★★★ 5
You could pay a lot more, but why would you?
Size: 6.0 Qt, Color: Linen Gray
Technically, this is a French oven, which is enameled. A Dutch oven is bare cast iron. I like these mainly for baking bread. The French oven traps the moisture coming out of the bread, and converts it to steam, which is essential for a good crust. (Search 'Jenny Can Cook no knead bread' for a recipe that is so simple and effective and forgiving that you will find it hard to believe it works, even after you've done it dozens of times.) Long ago, I got a Le Creuset just like this, for about 10 times the price. I worked like crazy to keep it looking like new, but before too long, it looked like something from Goodwill. As a test, I just made two loaves of bread, one in the Le Creuset, one in this, and I could not tell the difference. It may be that down the line, the Amazon Basics will crack, or sustain some damage to the enamel, or something like that. But I could replace it 9 times before spending as much as I spent on the Le Creuset! As far as I can tell, you're getting the same quality, without paying for the name. Why wouldn't you do that?
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 1, 2026
A
AMD1214
Dallas, US
★★★★★ 5
Very nice cast iron, enamel coated Dutch Oven! Good price too.
Size: 6.0 Qt, Color: Clay, Size: 6.0 Qt, Color: Clay
Very nice cast iron, enamel coated Dutch Oven! Although this is an Amazon Basics product, there isn't anything basic at all about it - heavy weight, evenly distributed enamel color, nice alignment between lid and body and dimpled under lid lining (which is normally on more expensive pots). The dimples under the lid are designed to help "self-baste" when cooking roasts, etc. The steam and liquid produced while cooking wraps around inside the lid and each of the dimples drips the liquid back into the dish evenly. I have a more expensive pot with this feature, but none of my cheaper ones have it. My first cook in the pot (small roast w/vegetables) turned out great, with minimal staining. After cooking, the cleanup was a snap with no issues getting it pristine. I do know after extended use (experience with my other pots) there may be some darkening of the interior enamel or some "seasoning stains", but that's to be expected. Overall a really nice pot for the price...should last a long time and be a trusted piece of cookware.
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Reviewed in the United States on June 2, 2026
B
book worm
Lexington, US
★★★★★ 4
Has some casting/finish imperfections, but functions well...
Size: 6.0 Qt, Color: Olive
I had been shopping for an enameled cast iron pot for a while when I saw this one, so I thought I'd check it out and see whether it was comparable in quality to the ones I'd looked at. The exterior of this Chinese-made Amazon Basics Cast Iron Dutch Oven is a lovely subtle green enamel, and the inside is warm cream color: I do love the color. In the particular pot I received, though there are some irregularities in the casting of the cast iron itself, though, leading to an uneven/pitted interior surface in places, which is both visually obvious and easy to feel when running one's fingers over it. There were also a couple little rust spots in the exposed bit of cast iron at the rim of the pot, easy enough to fix but something that suggests this pot was stored in a more damp/humid location. I'm picky about my cookware, so I found the uneven interior surface flaws disappointing and have a few concerns about how easy the pitted area will be to clean. That being said, the pot does heat well and evenly and performs as one would expect a cast iron Dutch oven: I made a roast and then stew in this pot, and both meals came out well. So while this cast iron covered pot doesn't match the quality of the ones I'd previously looked at, the retail price point is also lower, so this might be a good entry-level cast iron enameled pot for someone who doesn't mind a few finish imperfections.
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Reviewed in the United States on May 30, 2026
J
Julie
Bozeman, US
★★★★★ 5
Large capacity and great price! This is a steal!
Size: 6.0 Qt, Color: Linen Gray, Size: 6.0 Qt, Color: Linen Gray
I bake a LOT of sourdough bread, and this dutch oven is a super heavy-duty cast iron with an enameled finish. It's flawless and spreads the heat evenly when baking. The clean up is easy--I just spray a touch of dish soap and use a damp washcloth to rub it clean. Rinse thoroughly and allow to air dry. I put a touch of oil around the exposed rim to keep in seasoned and rust-free. The lid knob as well as the side handles make this easy to handle and helps distribute the weight when removing it from the oven. The included rubber rim protectors are a nice touch, and I use that on all of my cast iron when storing them away. The price on this is amazing for such a large 6-quart capacity. I find this to be a super value and would highly recommend this Dutch oven.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 2, 2026

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