Denso Iridium Race Spark Plugs - Set of 4

This is our secret weapon spark plug for high horsepower direct injected LNF, LHU, and LTG cars (500+whp).  Iridium Power® plugs are for drivers that care about performance as well as drivers that care about mileage. These plugs best demonstrate their performance improvement during acceleration. The world's smallest center electrode (0.4mm) and specially shaped ground electrode delivers maximum spark energy while withstanding temperatures greater than 4000º F. These features combine to achieve higher ignitability and require lower spark voltage than ever before. As a result, acceleration improves in comparison with normal plugs.Features: Tapered cut, U-Groove ground electrode 0.4mm iridium center electrode 360-degree laser welding assembly process Benefits: Required ignition voltage reduced Unsurpassed center electrode durability We generally recommend a .028" gap depending on overall power level.  However due to the fragile tip, a proper gapping tool must be used. OEM torque spec