Are these for you?
With an increasing demand for a truly dedicated high performance spark plug, Brisk answered the call for the MX-5. These plugs have a better ignitability than conventional performance spark plugs, and offer better performance and reliability in high boost, nitrous or high compression applications. Also, with a lower terminal to electrode resistance your coil pack becomes more effective without any modification. Excellent resistance to fouling under light load operation Silver is the best electrical conductor of all metals - Most free electrons - Best power delivery - Most powerful spark Construction: 1.5 mm Silver Fine Wire Center Electrode - Low ignition voltage requirements (easier for spark to jump over) - Reduces stress and wear on your coil and other ignition components - Fires properly even if partially fouled, where standard plugs will fail. 

Which one do I choose?
The plug options in the drop down menu are there to make sure we send you the proper heat range plug. Proper heat range selection is crucial for plug longevity so don't choose a "High boost" plug for your naturally aspirated car because it sounds like it will perform better. It will prematurely foul because your plug is not operating in the right temperature range.

• Naturally Aspirated - Non-turbo, Non-supercharged engines should all choose this.
• Low Boost - Lower boost, sub 16psi, supercharged or nitrous applications should choose this.
• High Boost - 16psi+ or high compression boosted applications should choose this. 

NOTICE: These are sold as a complete set of 4 plugs.