2-BR8ECS-S NGK SPARK PLUG #4172NGKs wide heat range results from using copper wire in place of the iron cores found in many conventional plugs Copper dissipates heat quicker, cooling the electrode and insulator tip Raised pre ignition rating with high conduction copper and long nose insulator Each meets the requirements of high performance engines Sold each FITS: Make Model Year Ski Doo Expedition 550 Sport 2007 Ski Doo Expedition 600 TUV 2007 Ski Doo GSX 600 H. O. SDI Limited 2006