Helps ensure proper engine performance, maximize fuel economy, minimize both tailpipe emissions and RFI electronic interference Radio-Frequency Interference (RFI) Suppression minimizes electronic noise Helps avoid spark plug failure, drivability complaints, pre-ignition and detonation DENSO patented 360 degree laser welding process, ensuring exceptional quality bond and structural strength with the iridium center electrode Larger spark translates to more power and superior fuel economy