DeutschTuning proudly offers NGK Laser Iridium Spark Plug (SILZKGR8B8S ) 1-step colder plug for B85. NGK Laser Iridium spark plugs offer the best combination of performance and longevity. We highly recommend these spark plugs for BMW B58 (340i, 240i, 440i) tuned platforms, these a 1-step colder plug from factory which offer great tolerance for B58's pushing more power (f30, f32,f22,f23,f33). Comes as a set of 6. Please contact us with any fitment or item questions.