DeutschTuning proudly offers NGK Racing Spark Plug Heat Range 9 GLA45/CLA45/A45 (M133) Colder Plug. NGK Racing Spark Plug Heat Range 9 (R2558E-9) NGK Racing spark plugs are designed with extreme use in mind and meant to withstand the most grueling racing conditions. NGK Spark Plugs have been powering racing champions and can be found in every racing venue throughout the world.Intended for racing use only. The center electrode of the NGK Racing spark plugs has special configurations and designs to ensure durability and ignitability. This spark plug is intended for tuned M133 engines mostly stage 2 and up. Comes a set of 4. Please contact us after purchasing for gapping and torque values.