CLASSIC MINI NGK SPARK PLUGS SET OF 4 BP7ES FOR FAST ROAD USE NOT INJECTION BM4
Classic Mini NGK Spark Plugs SET OF 4 For Fast Road/Tuned Road Engines
A higher compression engine should have a colder spark plug. The engineers explain that it has to do with flame temperature and overheating the plug. I know from experience that my race engine will melt a street plug.