Brisk Silver Racing Spark Plug - RR12YS

projected tip- low boost forced induction app. 2.3L Ecoboost Mustang: Full bolt on car with tune - 1 heat range colder than stock BRISK Silver Racing RR12YS Spark Plug 14mm thread, 25mm reach, 5/8'(16mm) hex, tapered seat, projected tip, resistor, fine wire 1.5mm Silver center el., Cut-back ground electrode Brisk Silver Racing plugs have a better ignitability than conventional performance spark plugs, and offer better performance and reliability in high boost, nitrous or high compression applications. Silver is an element with the most free electrons, and is the best electrical and thermal (heat) conductor of all metals! Better than gold, copper ...and many times better than Iridium. The Brisk Silver Racing plugs have a fine wire center electrode (not just the tip), which gives more room for insulator between the center electrode and spark plug shell. More insulation results in a durable spark plug with high dielectric strength - the most important spark plug parameter in forced in