Featuring what E3 calls Diamondfire technology, E3 spark plugs provide a better spark, which burns fuel more thoroughly and effectively. Used in a variety of performance applications, and available in most standard sizes, E3 spark plugs will help your engine achieve power and efficiency gains. Racecar Engineering™ is proud to distribute and support the entire E3 Spark Plugs® product line. Shop here online now for the most popular items from E3 Spark Plugs®. Always remember, if you don't find what you need on here our website, we'll gladly special order the item for you directly from the factory. Please contact our Technical Sales staff for complete information.