Login
JB1 to JB4 Upgrade Kit
JB1 to JB4 Upgrade Kit
JB1 to JB4 Upgrade Kit
 Next

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
Easy Shipping

Quick Dispatch:

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

Order Tracking:

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

Need Help?
Questions about JB1 to JB4 Upgrade Kit, sizing, or delivery? We're just an email away.

Live Shipping Estimates:
Enter your location at checkout to see available shipping methods and costs for JB1 to JB4 Upgrade Kit in your area.

Get Shipping Estimates

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 2391 reviews
Sort
Highest Rating
Newest First
Oldest First
Product Reviews
C
Verified Purchase
Cat Flo
Chelsea, US
★★★★★ 3
It’s ok could be cooler
Color: Light Gray, Size: Queen
Decent — could be cooler. They’re a nice color and texture. It fit my pillows well no annoying zippers it’s nice to sleep on and stay in place.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 8, 2026
K
Verified Purchase
kenneth e tompor
Battle Creek, US
★★★★★ 5
Comfort
Color: Champagne, Size: Queen
What a lifesaver, great feel, and awesome cooling feel
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 2, 2026
A
Verified Purchase
Andrew
New York, US
★★★★★ 5
Cool bedding
Color: Champagne, Size: Queen
As advertised nice and soft. But most of all cool. It really stays cool, especially on warm nights. A.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 26, 2026
S
Verified Purchase
2021 self improvement challenge
West Palm Beach, US
★★★★★ 5
Actually cooling and comfortable.
Color: Royal Blue, Size: King
Incredible cases. Soft, super comfortable and actually cooling as claimed. Highly recommended. Love these!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2026
J
Verified Purchase
Janet L. Dolbow
Lexington, US
★★★★★ 5
Cool
Color: Pink, Size: Standard
Cooling pillowcases work well, don’t wake up sweaty anymore. Very happy with them. Love the material, comfort and softness!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 7, 2026

recommand products

Island/Pool Table-Cyan Designs-10382
Island/Pool Table-Cyan Designs-10382
354.38
 Furniture-Arteriors Home-FTU05
Furniture-Arteriors Home-FTU05
4775.00
 Sconces-Hudson Valley-7004
Sconces-Hudson Valley-7004
315.20
 Decor/Home Accents-Arteriors Home-WMI58
Decor/Home Accents-Arteriors Home-WMI58
1307.50
 Lamps-Arteriors Home-PTI21-SH060
Lamps-Arteriors Home-PTI21-SH060
595.00