HKS M45IL, M45XL High Performance Spark Plugs for Kia, Hyundai, GenesisHKS M Series Super Fire Racing spark plugs are high performance Iridium plugs designed to handle advanced levels of tuning and provide Improved ignition performance, durability, and anti carbon build up. M45IL are for the 3. 3t platforms (Stinger, G70) while M45XL are for the 2. 0t, 2. 5t, and 1. 6t platforms. These plugs come pre gapped to 0. 028" from HKS which is suitable for use but we suggest closing the gap down to 0. 022" for maximum