{"product_id":"ngk-ix-iridium-spark-plug-box-of-4-part-number-6684-for-porsche-911-and-performance-vehicles","title":"NGK IX Iridium Spark Plug Box of 4 (Part Number 6684) for Porsche 911 and Performance Vehicles","description":"NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. NGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode's durability is six times harder than platinum. Iridium alloy's extremely high melting point is perfect for today's engines. For even greater performance consider upgrading to an NGK Ruthenium HX plug.\nNGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability.\nPORSCHE 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)\n\u003cul\u003e\n  \u003cli\u003eRECOMMENDED USAGE: Modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs\u003c\/li\u003e\n  \u003cli\u003eTrivalent metal plating for superior anti-corrosion and anti-seizing properties\u003c\/li\u003e\n  \u003cli\u003eOutstanding acceleration, high fuel efficiency and durability\u003c\/li\u003e\n  \u003cli\u003eFine iridium tip ensures durable and consistent spark\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe NGK IX Iridium Spark Plugs are engineered for high-performance applications and enthusiast drivers seeking reliable ignition and superior engine response. Featuring a fine iridium tip, these plugs provide outstanding ignition efficiency, enhanced acceleration, and improved fuel economy. Their durable design ensures consistent performance across a wide range of driving conditions, making them an excellent upgrade from standard nickel alloy spark plugs. The trivalent metal plating offers superior anti-corrosion and anti-seizing properties, extending the lifespan of the plugs and maintaining optimal performance over time. Designed specifically for vehicles such as Porsche 911 models from 1971 to 1989, as well as various motorcycles, ATVs, and PWC, these plugs are suitable for high-performance and modified engines needing a colder heat range than original equipment. The tapered cut ground electrode enhances starting, idling, and throttle response, providing drivers with a smoother and more responsive driving experience. The iridium alloy's high melting point and six times harder durability than platinum ensure longevity and reliable spark delivery, even under demanding conditions. For those seeking even greater performance, NGK offers the Ruthenium HX plug as a recommended upgrade. These plugs are part of NGK’s commitment to quality and precision, making them an ideal choice for automotive enthusiasts and professional mechanics alike.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eDesigned for high-performance and modified engines for improved ignition and throttle response\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eFine iridium tip provides durable and consistent spark for enhanced acceleration and fuel efficiency\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eTrivalent metal plating offers superior anti-corrosion and anti-seizing properties\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eTapered cut ground electrode improves starting, idling, and throttle response\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eCompatible with a wide range of vehicles including Porsche 911 models from 1971 to 1989 and various motorcycles, ATVs, and PWC\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eColder heat range than OE for demanding, high-performance applications\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eDurable iridium alloy with a melting point that withstands extreme engine conditions\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003eRecommended as an upgrade from OEM nickel alloy spark plugs for enthusiasts and performance applications\u003c\/li\u003e\u003c\/ul\u003e\u003cbr\u003e\nFitment:\u003cbr\u003e\n1964 Ferrari 275 GTB Base\u003cbr\u003e\n1965 Ferrari 275 GTB Base\u003cbr\u003e\n1966 Ferrari 275 GTB Base\u003cbr\u003e\n1967 Ferrari 275 GTB Base\u003cbr\u003e\n1968 Ferrari 275 GT Base\u003cbr\u003e\n1968 Ferrari 275 GTB Base\u003cbr\u003e\n1968 Ferrari Dino 206 GT Base\u003cbr\u003e\n1969 Ferrari Dino 206 GT Base\u003cbr\u003e\n1969 Ferrari Dino 246 GT Base\u003cbr\u003e\n1970 Ferrari Dino 246 GT Base\u003cbr\u003e\n1970 Porsche 911 S\u003cbr\u003e\n1971 Ferrari Dino 246 GT Base\u003cbr\u003e\n1971 Porsche 911 S\u003cbr\u003e\n1972 Ferrari Dino 246 GT Base\u003cbr\u003e\n1972 Ferrari Dino 246 GTS Base\u003cbr\u003e\n1973 Ferrari Dino 246 GT Base\u003cbr\u003e\n1973 Ferrari Dino 246 GTS Base\u003cbr\u003e\n1974 Porsche 911 Carrera\u003cbr\u003e\n1975 Porsche 911 Carrera\u003cbr\u003e\n1976 Porsche 911 Turbo Carrera\u003cbr\u003e\n1977 Porsche 911 Turbo Carrera\u003cbr\u003e\n1978 Porsche 930 Turbo\u003cbr\u003e\n1979 Porsche 930 Turbo\u003cbr\u003e\n1981 Yamaha XJ650L Turbo Seca Base\u003cbr\u003e\n1982 Yamaha XJ650L Turbo Seca Base\u003cbr\u003e\n1983 Maserati Biturbo Base\u003cbr\u003e\n1983 Yamaha XJ650L Turbo Seca Base\u003cbr\u003e\n1984 Maserati Biturbo Base\u003cbr\u003e\n1985 Maserati Biturbo Base\u003cbr\u003e\n1985 Yamaha XJ700 Maxim Base\u003cbr\u003e\n1986 Maserati Biturbo Base\u003cbr\u003e\n1986 Porsche 911 Turbo Carrera\u003cbr\u003e\n1987 Maserati Biturbo Base\u003cbr\u003e\n1987 Porsche 911 Turbo Carrera\u003cbr\u003e\n1988 Kawasaki KD80 Base\u003cbr\u003e\n1988 Porsche 911 Turbo Carrera\u003cbr\u003e\n1989 Kawasaki KD80 Base\u003cbr\u003e\n1989 Maserati 430i Base\u003cbr\u003e\n1989 Porsche 911 Turbo Carrera\u003cbr\u003e\n1990 Maserati 430i Base\u003cbr\u003e\n1996 Polaris Hurricane Base\u003cbr\u003e\n1996 Polaris SL 780 Base\u003cbr\u003e\n1996 Polaris SL 900 Base\u003cbr\u003e\n1996 Polaris SLT 780 Base\u003cbr\u003e\n1996 Polaris SLTX Base\u003cbr\u003e\n1996 Polaris SLX 780 Base\u003cbr\u003e\n1997 Polaris Hurricane Base\u003cbr\u003e\n1997 Polaris SL 1050 Base\u003cbr\u003e\n1997 Polaris SL 700 Base\u003cbr\u003e\n1997 Polaris SL 780 Base\u003cbr\u003e\n1997 Polaris SL 900 Base\u003cbr\u003e\n1997 Polaris SLT 780 Base\u003cbr\u003e\n1997 Polaris SLTX Base\u003cbr\u003e\n1998 Polaris SLTX Base\u003cbr\u003e\n1999 Polaris SLH Base\u003cbr\u003e\n1999 Polaris SLTH Base\u003cbr\u003e\n1999 Polaris SLTX Base\u003cbr\u003e\n1999 Polaris SLX Base\u003cbr\u003e\n2000 Polaris PRO 1200 Base\u003cbr\u003e\n2000 Polaris SLH Base\u003cbr\u003e\n2000 Polaris Virage Base\u003cbr\u003e\n2001 Polaris PRO 1200 Base\u003cbr\u003e\n2001 Polaris SLH Base\u003cbr\u003e\n2001 Polaris Virage Base\u003cbr\u003e\n2002 Polaris Freedom Base\u003cbr\u003e\n2002 Polaris Virage Base\u003cbr\u003e\n2003 Polaris Freedom Base\u003cbr\u003e\n2003 Polaris Virage Base\u003cbr\u003e\n2004 Aprilia Mojito Custom 50 Base\u003cbr\u003e\n2004 Polaris Freedom Base\u003cbr\u003e\n2004 Polaris Virage Base\u003cbr\u003e\n2005 Aprilia Mojito Custom 50 Base\u003cbr\u003e\n2006 Aprilia Mojito Custom 50 Base\u003cbr\u003e\n2007 Aprilia Mojito Custom 50 Base\u003cbr\u003e\n2010 Cobra CX50-SR Base\u003cbr\u003e\n2011 Cobra CX50-JR Base\u003cbr\u003e\n2011 Cobra CX50-SR Base\u003cbr\u003e\n2012 Cobra CX50-JR Base\u003cbr\u003e\n2012 Cobra CX50-SR Base\u003cbr\u003e\n2013 Cobra CX50-JR Base\u003cbr\u003e\n2013 Cobra CX50-SR Base\u003cbr\u003e\n2014 Cobra CX50-JR Base\u003cbr\u003e\n2014 Cobra CX50-SR Base\u003cbr\u003e\n2015 Cobra CX50-JR 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