SKU: 52297969894

JB4 Fuel Pressure Upgrade Kit for 2020+ BMW B58, S58, B48, Supra

Sale price$157.50 Regular price$175.00
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Ships within 48 hours · Estimated delivery Aug 9 - Aug 14

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Description

JB4 Fuel Pressure Upgrade Kit for 2020+ BMW B58, S58, B48, SupraFinally an upgrade kit that adds a high fuel pressure connection to the JB4 for B58 B48 Gen2 and S58 platforms allowing direct control of fuel pressure and fuel trims. Most useful for manual transmission vehicles or those running heavy E85 mixtures on a locked ECU. It's easy to install and includes a replacement JB4 board and a fuel pressure connector harness that attaches to your existing JB4 harness. Note this kit is not compatible with Gen1 B58

Finally an upgrade kit that adds a high fuel pressure connection to the JB4 for B58/B48 Gen2 and S58 platforms allowing direct control of fuel pressure and fuel trims. Most useful for manual transmission vehicles or those running heavy E85 mixtures on a locked ECU.

It's easy to install and includes a replacement JB4 board and a fuel pressure connector harness that attaches to your existing JB4 harness.

Note this kit is not compatible with Gen1 B58 motors.

Customers who purchased their JB4 new from Palenon Performance can receive a $75 core refund for their original JB4 board. To take advantage of this core refund ship your original board along with copies of the original JB4 purchase receipt and your JB4 upgrade kit order number to the address on our website. Cores must be received 45 days after upgrade kit receipt to qualify.

For installation directions and additional information click here.

Vehicle Fitment

BMW 2 Series
• 2022+ B58 G42 BMW M240i, M240i xDrive, and M240xi
• 2023+ S58 G87 BMW M2
• 2022+ G42 B48 BMW 220i, 230i
• 2020-2021 F22 F23 B48 BMW 230i including xDrive
• 2020-2021 F22 F23 B48 BMW 225i including xDrive

BMW 3 Series
• 2019+ B58 G20 G21 BMW M340i, 
M340i xDrive, and M340xi
• 2021+ S58 G80 BMW M3
• 
2021+ S58 G80 BMW M3 Competition
• 2020+ G20 G21 B46 B48 BMW 318i, 320i, 320Li, 320e, 330i, 330e, 320Li including xDrive

BMW 4 Series
• 2021+ B58 G22 G23 G26 BMW M440i, 
M440i xDrive, and M440xi including Gran Coupe
• 2021+ S58 G82 BMW M4
• 2021+ S58 G82 BMW M4 Competition
• 2022+ S58 G83 BMW M4 Convertible
• 2021+ G22 G23 G26 B48 BMW 420i, 430i including Gran Coupe and xDrive
• 2020 F32 F33 F36 B48 BMW 430i including Gran Coupe and xDrive
• 2020 F32 F33 F36 B48 BMW 425i including xDrive


Toyota Supra
• 2020-2026 Toyota GR Supra Mk5 B58 3.0L 6 cyl.
• 2020-2026 Toyota GR Supra Mk5 B48 2.0L 4 cyl.

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: 52297969894

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R. Nixon
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★★★★★ 5
It looks Good
Very Nice track suit. All Good, no issues.
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Reviewed in the United States on November 17, 2025
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Jim
Dallas, US
★★★★★ 5
Comfy shoes
Size: 10.5, Color: Cognac
Comfy shoes! My husband loved his black pair so bought the browns one too!
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Reviewed in the United States on May 4, 2026
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dcdad
Waukegan, US
★★★★★ 5
Love the simple perfect shape
Size: 11, Color: Chestnut
The problem of the sides rubbing can be solved by stepping on the back till flat as if wearing sandals. This bends the side enough to never rub again when worn in the normal way.
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Reviewed in the United States on January 22, 2026
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Homemaker
Carnegie, US
★★★★★ 5
Consistent quality
Size: 11.5, Color: Black
Have used these shoes continually for the past 10 years. I really appreciated they continue to be a standard size and style without any deviations so that I can reliably reorder these and count on them fitting exactly as expected.
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Reviewed in the United States on November 19, 2025
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Me. Myself, and I.
Cuba, US
★★★★★ 5
Nice shirt.
Color: Black, Size: XX-Large
Good neck height, not too high, firm neck grip without the choke feel. Clean look when wearing under an open shirt or looks good alone, Soft feel against the skin, and it washes well, no pulling or color fade. semi-form-fitting on the body, but not tight for the size. priced well.
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Reviewed in the United States on May 25, 2026

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