JB4 Fuel Pressure Upgrade Kit for 2020+ BMW B58/S58 & B58 Supra

OVERVIEW

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

SPECS

• Includes a replacement JB4 board and a fuel pressure connector harness that attaches to your existing JB4 harness
• Not compatible with Gen1 B58 motors
• Core refund program: customers who purchased their JB4 new from BMS or an authorized reseller can receive a $75 core refund by shipping their original board, purchase receipt, and upgrade kit order number to BMS within 45 days of receiving the upgrade kit

PARTS INCLUDED

• 1x replacement JB4 board
• 1x fuel pressure connector harness

TECH RESOURCES

• Requires an existing JB4 installed on the vehicle
• Easy install — swap in the replacement JB4 board and connect the fuel pressure connector harness to your existing JB4 harness
• See the JB4 fuel pressure control setup and tuning discussion for details

VEHICLE APPLICATIONS