FEATURES Unique electrode shape maximizes the power created by the spark plug - Diamond Fire technology Electrode is a combination of performance and technology that results in an improved flame kernel shape This flame front ignites the bulk air/fuel mixture faster, moves heat into the combustion chamber faster and creates a more localized pressure front for faster pressure rise during the cylinder power stroke The result is more complete combustion and an improvement in engine performance A truly premium performance plug Sold each Cross Reference# NGK - D6EA NGK - DCPR7E NGK - DCPR7EIX NGK - DCPR8E NGK - DCPR8EIX NGK - DPR7EA9 NGK - DPR7EIX NGK - DPR8EIX9 NGK - DR7EIX NGK - DR7ES NGK - DR8EIX NGK - DR8ES NGK - IZKR7B Champion - RA6HC Champion - RA8HC