Article no.:
7189
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NGK Iridium IX Spark Plug Box of 4 (XR4IX)
Take your vehicle's performance to the next level with the NGK Iridium IX Spark Plug Box of 4 (XR4IX). Designed for the performance enthusiast, these spark plugs provide outstanding acceleration, high fuel efficiency, and durability.
With their tapered cut ground electrode, NGK Iridium IX spark plugs offer improved starting, idling, and throttle response. The Iridium fine wire center electrode is six times harder than platinum, ensuring exceptional durability and resistance to wear.
- Extreme ignitability and exceptional anti-fouling
- Tapered cut ground electrode for improved performance
- Iridium fine wire center electrode for exceptional durability
- Perfect for modified or high-performance applications
This product fits more vehicles than loaded. Please select your vehicle to see all fits.
| Make | Model | Year | Type |
|---|---|---|---|
| Buick | Century | 1954 | Base |
| Buick | Century | 1955 | Base |
| Buick | Century | 1956 | Base |
| Buick | Century | 1957 | Base |
| Buick | Century | 1958 | Base |
| Buick | Electra | 1959 | 225 |
| Buick | Electra | 1959 | Base |
| Buick | Electra | 1960 | 225 |
| Buick | Electra | 1960 | Base |
| Buick | Electra | 1961 | 225 |
| Buick | Electra | 1961 | Base |
| Buick | Electra | 1962 | 225 |
| Buick | Electra | 1962 | Base |
| Buick | Electra | 1963 | Base |
| Buick | Electra | 1964 | Base |
| Buick | Electra | 1965 | Base |
| Buick | Gran Sport | 1965 | Base |
| Buick | Gran Sport | 1967 | Base |
| Buick | Invicta | 1959 | Base |
| Buick | Invicta | 1960 | Base |
| Buick | Invicta | 1961 | Base |
| Buick | Invicta | 1962 | Base |
| Buick | Invicta | 1963 | Base |
| Buick | LeSabre | 1959 | Base |
| Buick | LeSabre | 1960 | Base |
| Buick | LeSabre | 1961 | Base |
| Buick | LeSabre | 1962 | Base |
| Buick | LeSabre | 1963 | Base |
| Buick | LeSabre | 1964 | Base |
| Buick | LeSabre | 1965 | Base |
| Buick | LeSabre | 1965 | Custom |
| Buick | Limited | 1958 | Base |
| Buick | Riviera | 1963 | Base |
| Buick | Riviera | 1964 | Base |
| Buick | Riviera | 1965 | Base |
| Buick | Roadmaster | 1953 | Base |
| Buick | Roadmaster | 1954 | Base |
| Buick | Roadmaster | 1955 | Base |
| Buick | Roadmaster | 1956 | Base |
| Buick | Roadmaster | 1957 | 75 |
| Buick | Roadmaster | 1957 | Base |
| Buick | Roadmaster | 1958 | Base |
| Buick | Skylark | 1954 | Base |
| Buick | Skylark | 1965 | Base |
| Buick | Skylark | 1966 | Base |
| Buick | Skylark | 1967 | Base |
| Buick | Special | 1951 | Base |
| Buick | Special | 1952 | Base |
| Buick | Special | 1953 | Base |
| Buick | Special | 1954 | Base |
| Buick | Special | 1955 | Base |
| Buick | Special | 1956 | Base |
| Buick | Special | 1957 | Base |
| Buick | Special | 1958 | Base |
| Buick | Special | 1962 | Base |
| Buick | Special | 1963 | Base |
| Buick | Special | 1963 | Deluxe |
| Buick | Special | 1965 | Base |
| Buick | Special | 1965 | Deluxe |
| Buick | Special | 1966 | Base |
| Buick | Special | 1966 | Deluxe |
| Buick | Special | 1967 | Base |
| Buick | Special | 1967 | Deluxe |
| Buick | Sportwagon | 1965 | Base |
| Buick | Sportwagon | 1966 | Base |
| Buick | Sportwagon | 1966 | Custom |
| Buick | Sportwagon | 1967 | Base |
| Buick | Super | 1951 | Base |
| Buick | Super | 1952 | Base |
| Buick | Super | 1953 | Base |
| Buick | Super | 1954 | Base |
| Buick | Super | 1955 | Base |
| Buick | Super | 1956 | Base |
| Buick | Super | 1957 | Base |
| Buick | Super | 1958 | Base |
| Buick | Wildcat | 1963 | Base |
| Buick | Wildcat | 1964 | Base |
| Buick | Wildcat | 1965 | Base |
| Buick | Wildcat | 1965 | Custom |
| Buick | Wildcat | 1965 | Deluxe |
| Cadillac | Calais | 1967 | Base |
| Cadillac | DeVille | 1967 | Base |
| Cadillac | Eldorado | 1967 | Base |
| Cadillac | Fleetwood | 1967 | 60 Special |
| Cadillac | Fleetwood | 1967 | 75 |
| Cadillac | Fleetwood | 1967 | Base |
| Cadillac | Series 60 Fleetwood | 1950 | Base |
| Cadillac | Series 60 Fleetwood | 1951 | Base |
| Cadillac | Series 60 Fleetwood | 1952 | Base |
| Cadillac | Series 61 | 1950 | Base |
| Cadillac | Series 61 | 1951 | Base |
| Cadillac | Series 62 | 1952 | Base |
| Cadillac | Series 62 | 1952 | DeVille |
| Cadillac | Series 75 Fleetwood | 1950 | Base |
| Cadillac | Series 75 Fleetwood | 1951 | Base |
| Cadillac | Series 75 Fleetwood | 1952 | Base |
| Chevrolet | Bel Air | 1950 | Base |
| Chevrolet | Bel Air | 1951 | Base |
| Chevrolet | Bel Air | 1952 | Base |
| Chevrolet | Bel Air | 1953 | 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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