JB4 Fuel Pressure Upgrade Kit for 2020+ BMW B58, S58, B48, Supra 718 • Larger 52mm Inside Diameter•

• Larger 52mm Inside Diameter• 65mm Outside Diameter• Increased Turbo Sound

Read our FAQ and install the guide below

This CNC machined bolt on adapter allows you to mount a single BMS WMI nozzle WITHOUT the expense and headache of removing

(1) Aluminum Lower charge pipe (turbo)

Installing b58 catless downpipes will trigger a check engine light (CEL) due to the absence of OEM catalysts

JB4 Fuel Pressure Upgrade Kit for 2020+ BMW B58, S58, B48, Supra 718 • Larger 52mm Inside Diameter•Finally an upgrade kit that adds a high fuel pressure connection to the JB4 for B58 B48 Gen2 and S58 platforms allowing direct control of fuel pressure and fuel trims. Most useful for manual transmission vehicles or those running heavy E85 mixtures on a locked ECU. It's easy to install and includes a replacement JB4 board and a fuel pressure connector harness that attaches to your existing JB4 harness. Note this kit is not compatible with Gen1 B58