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NGK Iridium IX Spark Plug Box of 4 (WR5IX)

Unlock the full potential of your vehicle with the NGK Iridium IX Spark Plug Box of 4 (WR5IX). Designed for performance enthusiasts, these spark plugs provide outstanding acceleration, high fuel efficiency, and durability.

Key Features:

  • Extreme ignitability and exceptional anti-fouling
  • Tapered cut ground electrode for improved starting, idling, and throttle response
  • 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

Upgrade your vehicle's performance with the NGK Iridium IX Spark Plug Box of 4 (WR5IX). Recommended for modified or high-performance applications, or as an upgrade to OE nickel alloy spark plugs.

This product fits more vehicles than loaded. Please select your vehicle to see all fits.

Make Model Year Type
Dodge Ram 3500 1994 Base
Ford Bronco 1966 Base
Ford Bronco 1967 Base
Ford Bronco 1968 Base
Ford Bronco 1968 Roadster
Ford Bronco 1968 Wagon
Ford Bronco 1969 Base
Ford Bronco 1969 Roadster
Ford Bronco 1969 Wagon
Ford Bronco 1970 Base
Ford Bronco 1970 Wagon
Ford Bronco 1971 Base
Ford Bronco 1971 Wagon
Ford Bronco 1972 Base
Ford Bronco 1972 Wagon
Ford Bronco 1973 Base
Ford Bronco 1973 Wagon
Ford Bronco 1974 Base
Ford Bronco 1980 Custom
Ford Bronco 1980 Ranger XLT
Ford Bronco 1981 Custom
Ford Bronco 1981 Ranger XLT
Ford Bronco 1982 Custom
Ford Bronco 1982 XLS
Ford Bronco 1982 XLT Lariat
Ford Bronco 1983 Custom
Ford Bronco 1983 XLS
Ford Bronco 1983 XLT Lariat
Ford Bronco 1984 Custom
Ford Bronco 1984 XLT
Ford Bronco 1985 Custom
Ford Bronco 1985 Eddie Bauer
Ford Bronco 1985 XLT
Ford Bronco 1986 Custom
Ford Bronco 1986 Eddie Bauer
Ford Bronco 1986 XLT
Ford Club 1955 Base
Ford Club 1956 Base
Ford Club 1957 Base
Ford Club 1958 Base
Ford Club 1959 Base
Ford Club Wagon 1962 Base
Ford Club Wagon 1963 Base
Ford Club Wagon 1963 Deluxe
Ford Club Wagon 1964 Base
Ford Club Wagon 1965 Base
Ford Club Wagon 1967 Base
Ford Club Wagon 1967 Custom
Ford Club Wagon 1967 Deluxe
Ford Country Sedan 1955 Base
Ford Country Sedan 1956 Base
Ford Country Sedan 1957 Base
Ford Country Sedan 1958 Base
Ford Country Sedan 1959 Base
Ford Country Sedan 1960 Base
Ford Country Sedan 1961 Base
Ford Country Sedan 1962 Base
Ford Country Sedan 1963 Base
Ford Country Sedan 1964 Base
Ford Country Sedan 1965 Base
Ford Country Sedan 1966 Base
Ford Country Sedan 1967 Base
Ford Country Sedan 1968 Base
Ford Country Sedan 1969 Base
Ford Country Sedan 1970 Base
Ford Country Sedan 1971 Base
Ford Country Sedan 1972 Base
Ford Country Sedan 1973 Base
Ford Country Sedan 1974 Base
Ford Country Squire 1955 Base
Ford Country Squire 1956 Base
Ford Country Squire 1957 Base
Ford Country Squire 1958 Base
Ford Country Squire 1959 Base
Ford Country Squire 1960 Base
Ford Country Squire 1961 Base
Ford Country Squire 1962 Base
Ford Country Squire 1963 Base
Ford Country Squire 1964 Base
Ford Country Squire 1965 Base
Ford Country Squire 1966 Base
Ford Country Squire 1967 Base
Ford Country Squire 1968 Base
Ford Country Squire 1969 Base
Ford Country Squire 1970 Base
Ford Country Squire 1971 Base
Ford Country Squire 1972 Base
Ford Country Squire 1973 Base
Ford Country Squire 1974 Base
Ford Courier Sedan Delivery 1955 Base
Ford Courier Sedan Delivery 1956 Base
Ford Courier Sedan Delivery 1957 Base
Ford Courier Sedan Delivery 1958 Base
Ford Courier Sedan Delivery 1959 Base
Ford Courier Sedan Delivery 1960 Base
Ford Custom 1957 Base
Ford Custom 1964 Base
Ford Custom 1965 Base
Ford Custom 1966 Base
Ford Custom 1967 Base
NGK manufactures spark plugs and spark plug wires, as well as glow plugs for diesel applications. Their range of spark plugs cover everything from OEM replacement to Ultimate Performance plugs, and are available as traditional copper, platinum, or iridium tips. NGK’s reputation as an OEM supplier for many car manufacturers makes them a top choice for spark plugs. Few brands can make that claim and have the quality to back it up.
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