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NGK Iridium IX spark plugs (ZFR5FIX-11) box of four are built for higher ignitability, fuel efficiency and durability in modified or high-performance applications. The fine-wire iridium center electrode and tapered ground electrode improve starting, throttle response and anti-fouling characteristics while offering long electrode life. These plugs are recommended as an upgrade where OE iridium or performance-grade igniters are desired.
NGK Iridium Spark Plugs Box of 4 (ZFR5FIX-11)
