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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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Your JB1 to JB4 Upgrade Kit orders ship within 1-2 business days.

Delivery Options:

  • 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
4.3 ★★★★★
Based on 1803 reviews
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L
Verified Purchase
legalhobbit
Los Angeles, US
★★★★★ 5
Convenient!
Works well and easy to use! Lovely color and appreciated its portability and 2-in-1 shaver heads feature. Great battery capacity too. Highly recommend!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 3, 2026
O
Verified Purchase
O
Natrona Heights, US
★★★★★ 1
not worth it
doesn’t cut well and feels more like ripping hair out when it removes anything
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 4, 2026
R
Verified Purchase
roseybuds
Alexandria, US
★★★★★ 1
Not worth it
Pulls hair and doesn't go smooth don't buy
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 6, 2026
M
Verified Purchase
Manish
Fort Morgan, US
★★★★★ 5
Portable
Easy to use and highly portable
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 3, 2026
F
Verified Purchase
FBserr
Natrona Heights, US
★★★★★ 1
Broken trimmer
I received it broken. It never worked.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 5, 2026

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