M157 / M278 NGK Laser Iridium Spark Plugs

NGK Laser Iridium Spark Plugs with a one-step colder heat range are essential for optimal performance in tuned M157 and M278 Mercedes Benz engines. Pre-gapped at 0.032", they reduce misfire frequency even in stock vehicles while being critical for maintaining reliable ignition in modified setups. Featuring a platinum disc welded to the ground electrode for durability and trivalent metal plating to resist corrosion and seizing, these plugs deliver consistent, stable sparks that enable faster starts, improved acceleration, better fuel efficiency, and lower emissions.