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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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You'll receive a tracking link by email once your JB1 to JB4 Upgrade Kit ships.

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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
4.4 ★★★★★
Based on 895 reviews
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Product Reviews
C
Verified Purchase
CatMN
Draper, US
★★★★★ 5
Puppy loves her new octopus buddy!
We love this cute octopus plushy toy and our puppy does, too! They are so many great legs to chew and tug, and we love how big it is - 2x larger than our puppy. It’s holding up great to those sharp puppy teeth. 100% recommend.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 19, 2026
S
Verified Purchase
steven watts
Port Orchard, US
★★★★★ 1
Not durable
My dog loved it, but it lasted 2 days before he tore a hole in the eye and pulled fuzzy out. It’s not very durable for a big dog!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 29, 2026
B
Verified Purchase
Baleigh
Lowell, US
★★★★★ 2
Rips easily
Not a good product got torn after 5 minutes after my dog started playing with it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 3, 2026
L
Verified Purchase
LB
Charlottesville, US
★★★★★ 5
The best gun
Love this octopus. My puppy loves this toy. Has lasted longer than I thought it would for a stuffie. Would buy again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 8, 2026
C
Verified Purchase
Candice
Charlottesville, US
★★★★★ 3
Long shipping time
The dogs will love these but the shipping time is ridiculous and took forever to get them.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 24, 2025

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