NGK Spark Plugs (U.S.A.), Inc. is the largest OE supplier and manufacturer of spark plugs for domestic and import vehicles in North America. Its OE legacy, unsurpassed quality and leading vehicles in operation coverage reinforces NGK as The Ignition Specialist™. With over 80 years of automotive expertise NGK has built a reputation for quality and reliability; manufacturing spark plugs for virtually every automotive, motorcycle, marine and small engine application. We are committed to be the premier partner with our customers, while maintaining original equipment standards for the highest durability and operational performance. With state-of-the-art manufacturing, inventory and distribution facilities in North America and across the globe, NGK is dedicated to providing customers with world-class products and services. NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. PORSCHE 911 1986 1974 1971, ATV - 1984-1982 YAMAHA, M/C - 2004-2000 BETAMOTOR, 1986-1976 BMW, 1982 KAWASAKI, 1993 MOTO GUZZI, 1995-1978 SUZUKI, 2007-1974 YAMAHA, PWC - 1998-1994 POLARIS (COLDER HEAT RANGE THAN OE)