NGK Spark Plug Stock # 7348

The NGK Spark Plug Stock # 7348 (MPN UR6IX) is a premium ignition component designed for high-performance and modified automotive engines. As a seasoned mechanic, you know that spark plug selection directly impacts combustion efficiency, cold-start reliability, and overall engine responsiveness—especially in turbocharged or heavily modified platforms. This NGK unit serves enthusiasts and builders who demand consistent spark delivery across varying load conditions, making it an essential upgrade for anyone serious about engine tuning and reliability.

The UR6IX designation indicates this plug features NGK's proven iridium-core electrode technology, which resists erosion and maintains a precise spark gap even under extreme combustion pressures common in modified engines. Iridium electrodes run hotter and cleaner than standard copper, reducing fouling in high-boost or rich-running applications while extending service intervals. The compact 0.85-inch diameter and optimized 3.45-inch length allow it to fit snugly in tight engine bays, and the 0.09-pound weight ensures minimal parasitic load on valve train and ignition coil systems.

This spark plug is ideal for import sport compacts, turbocharged four-cylinders, and modified four-stroke engines where thermal stability and precise timing matter most. Upgrade from OEM plugs when you've increased boost pressure, altered fuel mapping, or installed a performance ECU—the UR6IX handles lean transient conditions and sustained high-load operation that factory units cannot tolerate. Installation is straightforward on most modern platforms; simply match the gap specification to your engine's tune and torque to manufacturer specs to ensure proper seat contact and heat dissipation.