Description
OEM iridium spark plug for BMW’s updated B58TU engines (G20 M340i, G29 Z4 M40i, Toyota GR Supra A91, and more). Engineered for high boost and direct injection, ensuring reliable ignition, long service life, and consistent performance in both stock and tuned setups.
Gap - Factory Preset: 0.030", we suggest closing gap to .022" for tuned applications.