SKU: 60996565278

JB4 for BMW GEN1 & GEN2 B58

$377.37 $419.30
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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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Grace
Fort Morgan, US
★★★★★ 5
A must try for hot sleepers!
Color: Blue, Size: Queen (U.S. Standard), Set name: Silky, Color: Blue, Size: Queen (U.S. Standard), Set name: Silky
If you are a hot sleeper these pillowcases are for you! Not only are they silky and beautiful, but they are cool to the touch!The Arc-Chill fabric absorbs heat and instantly cools your skin! If you are prone to insomnia, night sweats, give these a try! They come in a 2 pack and have a few different colors to try out. Highly recommend.
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Reviewed in the United States on May 27, 2026
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Allen Plemmons
Phoenix, US
★★★★★ 5
Freezing !
Color: Gray, Size: Queen (U.S. Standard), Set name: Stretchy and Soft
### Product Review: Avolare 2 Pack Cooling Pillow Cases #### Overview The Avolare 2 Pack Cooling Pillow Cases are designed to provide a cooler and more comfortable sleeping experience, especially for hot sleepers. Made with Arc-Chill fabric, these pillowcases promise to offer a cooling effect, protect hair and skin, and add a touch of luxury with their soft and silky texture. The pillowcases come in a standard gray color, suitable for standard and queen-size pillows. #### Material and Design **Rating: ★★★★★** The Avolare Cooling Pillow Cases are crafted from Arc-Chill fabric, known for its high Q-max value (>0.5), indicating excellent cooling properties. The material feels incredibly soft and silky to the touch, providing a luxurious feel that enhances sleep quality. The gray color is neutral and versatile, fitting seamlessly with various bedding styles. The design includes a hidden zipper, ensuring that the pillowcase stays securely on the pillow while maintaining a smooth and sleek appearance. The zipper is discreet and doesn’t interfere with comfort, which is a thoughtful addition to the overall design. #### Cooling Effect **Rating: ★★★★★** One of the standout features of these pillowcases is their cooling effect. The Arc-Chill fabric effectively wicks away heat and moisture, making them ideal for hot sleepers or those living in warmer climates. Users have reported a noticeable difference in temperature, which contributes to a more restful and comfortable night’s sleep. This cooling property is particularly beneficial during the summer months or for individuals who tend to overheat while sleeping. #### Hair and Skin Benefits **Rating: ★★★★☆** In addition to their cooling properties, the Avolare pillowcases are also beneficial for hair and skin. The smooth and silky texture reduces friction, helping to prevent hair breakage and skin irritation. This can be particularly advantageous for individuals with sensitive skin or those prone to hair damage. While the pillowcases are not a cure-all for skin and hair issues, they do contribute positively by creating a gentler surface. #### Durability and Care **Rating: ★★★★☆** The Avolare Cooling Pillow Cases are easy to care for, maintaining their cooling properties and softness even after multiple washes. They are machine washable, which adds to their convenience. However, it is recommended to follow the care instructions carefully to ensure the longevity of the cooling effect and fabric quality. #### Versatility **Rating: ★★★★☆** These pillowcases are designed to fit both standard and queen-size pillows, adding to their versatility. They are perfect for use in any bedroom setting, from master bedrooms to guest rooms, and can be paired with various pillow types and fillings. #### Pros and Cons **Pros:** - Excellent cooling properties ideal for hot sleepers. - Soft and silky texture is gentle on hair and skin. - Hidden zipper design for a secure fit. - Machine washable and easy to care for. - Versatile fit for standard and queen-size pillows. **Cons:** - Cooling effect may diminish slightly with frequent washing. - Limited color options (only available in gray). #### Final Verdict **Overall Rating: ★★★★☆** The Avolare 2 Pack Cooling Pillow Cases are an excellent choice for anyone looking to enhance their sleeping experience, particularly hot sleepers. The cooling properties of the Arc-Chill fabric, combined with the soft and silky texture, provide a comfortable and luxurious feel. The hidden zipper design adds practicality without sacrificing aesthetics. While there are minor drawbacks, such as potential diminishing of the cooling effect with frequent washing and limited color options, the overall benefits make these pillowcases a worthwhile investment. If you’re seeking to improve your sleep quality and enjoy a cooler, more comfortable night’s rest, the Avolare Cooling Pillow Cases are definitely worth considering.
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Reviewed in the United States on June 1, 2024
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Brian Olson
Lake Worth, US
★★★★★ 4
Cool as the other side of the pillow
Color: Gray, Size: Queen (U.S. Standard), Set name: Stretchy and Soft
Good quality and keeps cool on side of pillow. Have to flip pillow for constant cooling is the ok only down side. Love the material as it is very soft and silky feel to it. Doesn't wrinkle over pillow and had some good color options. Easy to clean. Fair price for a good product
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Reviewed in the United States on January 11, 2026
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Nik
Phoenix, US
★★★★★ 5
Love!
Color: Blue, Size: Queen (U.S. Standard), Set name: Stretchy and Soft
Awesome cases! They really are cool to the touch. I didn’t sleep hot at all. I have a “cut-out” memory foam pillow, and this stretched around it perfectly. It is flexible enough that it doesn’t impede with the cut out. And while the material is “silky,” it doesn’t slide around the pillow while sleeping on it. The zipper feature is perfect. I washed and dried per the tag instructions and they washed very well. Super happy.
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Reviewed in the United States on April 8, 2026
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Jane - NY
Louisville, US
★★★★★ 5
AMAZING - LOVE THESE!
Color: Blue, Size: Queen (U.S. Standard), Set name: Stretchy and Soft
I've been using these pillow cases for more than 6 months and LOVE them. They are well made, no wrinkling, fraying or wearing out, even with a weekly washing. I love the zippers on them, my pillows fits perfectly in the case and don't constantly escape from the case overnight. They definitely perform as described: they keep me cool at night and don't smell and actually don't make a mess of my hair. I bought an extra one and put it on a pillow I keep close to my body which helps me from overheating during the night. They are a great value for the price, I wish I could get top sheets in the same style as these and I'd be in heaven!
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Reviewed in the United States on March 23, 2026

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