Higher voltage ignition spark coils made by JoyFast for the NC MX-5 Miata from 2006 to 2015. This product will increase the voltage of the ignition and provide more low/medium torque as well as improved acceleration. This piece has been tested on a NC car for years and has survived over 200,000KM (120,000 miles)! If your car has over 30,000KM-40,000KM it’s a recommend product to replace your OEM ones. JoyFast High Spark Ignition Coils should be ordered at REV9 Autosport https://rev9autosport.com/joyfast-high-spark-ignition-coils-3269.html as they provide the best service and speed we've seen so far!