Wiring extras for the JB4 on BMW N54 engines - no fluff, no filler, just what you need to enable anti-lag, 2-step launch control and clean harness upgrades.
Pre-programmed JB4 anti-lag module + full harness: gear-select, hold volume button, floor it - instant flat-foot shifting and rolling anti-lag.
G5 2-STEP relay: rev-limited launches and no-lift shifts on manual N54s. Works with BMS DATA cable.
JB3-to-JB4 power wire: required when upgrading from JB3 or repairing a damaged JB4 harness.
Two POSI-TAPS: hand-tight, no-crimp connectors for secure, repeatable wire taps.
All parts tested, UK-stocked and ready for same-day dispatch.
