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JB1 to JB4 Upgrade Kit
JB1 to JB4 Upgrade Kit
JB1 to JB4 Upgrade Kit
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JB1 to JB4 Upgrade Kit

Marsoni M251S
Sale price$175.00
Pay 4 payments of $43.75 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
JB1 to JB4 Upgrade KitUpgrades your existing BMS Stage1 to a EA888 JB4 BETA system. The JB4 BETA features CANbus connectivity for more advanced tuning, direct AFR control, advanced safety systems for boost, air fuel ratio, fuel trims, and engine knock, boost mapping by gear for improved traction, integrated water meth control, and much more. The upgrade kit cost is $125 outright. There is no longer a core exchange program available. After the upgrade you can keep your old
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  • Standard: 3-7 business days
  • Fast: 2-3 business days
  • Express: 1-2 business days

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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
4.5 ★★★★★
Based on 423 reviews
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Product Reviews
A
Verified Purchase
Alessandra Acosta
Los Angeles, US
★★★★★ 5
Delicate look
Holds a lot of my bathroom accessories, sturdy and easy to install. Blends well with all my bathroom decor. Perfect price
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 17, 2025
D
Verified Purchase
Deyanira DeJesus
Bozeman, US
★★★★★ 5
Built really good
I was quite surprised on the craftsmanship. Everything turned out great when mounting my wife and I love the way it looks in the bathroom.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 30, 2024
T
Verified Purchase
Tom Vice
Chelsea, US
★★★★★ 4
Small but very nice
The shelves are sturdy and very nice. Make sure you look at the measurements before you order.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 5, 2024
I
Verified Purchase
Isabel
Grantham, US
★★★★★ 5
Great
Loved it. Looks super neat, had not oxidized whatsoever. Great size for an over the toilet shelf.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 1, 2025
Q
Verified Purchase
QueenB
Lowell, US
★★★★★ 5
Arrived quickly and as described.
These shelves were easy to install. Be aware that the wood is very, very soft. I would not recommend for any heavy decorations or items needing to be removed and replaced often. They are more for show than function.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 27, 2023

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