NGK 4482 Racing Platinum Spark Plug (Performance/Competition, 14 mm)

Vehicle Fitment

• Not assigned to specific street vehicles
• Intended for high-performance and racing engines (closed-course competition only)

Features

• Racing-series spark plug with platinum electrodes
• Fine-wire platinum center electrode enhances ignition efficiency
• Copper core aids heat dissipation under extreme conditions
• Triple gasket sealing resists combustion gas leakage
• Resistor type (~5000 Ω) suppresses ignition noise
• Solid terminal for secure ignition boot connection
• Ceramic insulator withstands high thermal shock
• Designed for high RPM and high-load competition use

Specifications

• NGK Part Number: 4482 / R6725-115
• Thread Size: 14 mm x 1.25
• Reach: 21.5 mm (0.846")
• Seat Type: Flat with gasket
• Heat Range: NGK 12 (racing-oriented)
• Center Electrode: Platinum on copper core
• Ground Electrode: Platinum alloy
• Gap (Factory): ~0.7 mm (0.028")
• Hex Size: 13/16" (21 mm)
• Resistor: Yes (~5000 Ω)

Included Components

• 1x NGK 4482 Racing Platinum Spark Plug (R6725-115)

Product Description

The NGK 4482 Racing Platinum Spark Plug (R6725-115) is engineered for competition engines and high-performance applications where sustained high RPM and extreme combustion heat are common. This racing-series plug features a fine-wire platinum center electrode and a durable platinum ground electrode that resist wear under harsh conditions.

With a copper core insulator for efficient heat transfer, a resistor to suppress electrical interference, and a performance-oriented heat range, the 4482 is best suited for closed-course use by serious racers and performance tuners. It is not assigned specific street vehicle fitments and should be selected based on engine bore size, threading, and heat range requirements for your application.