BMW B58 B48 S58 GR Supra JB4 Fuel Pressure Upgrade Kit

Direct fuel pressure control for JB4-equipped B58, B48 and S58 BMWs and Mk5 GR Supras (2020-2026). Fixes fuelling inconsistencies under load - especially on manual transmissions or high-E85 maps with locked ECUs.

• Replacement JB4 control board + plug-in fuel pressure harness - no cutting or splicing
• Bolt-on fit for existing Gen 2 JB4 users (not Gen 1 B58: F30/F32/F34/F36)
• Covers G20/G21 M340i, G80 M3, G22/G23/G26 M440i/M4, G42/G87 M240i/M2, and GR Supra 2.0L & 3.0L