OEM Temperature Plugs 2004+ STI / 2006-2014 WRX
Designed specifically for the performance enthusiast, NGK Iridium IX plugs offer super-efficient ignition, improved throttle response, and superior anti-fouling.
* Fine Iridium tip ensures longevity.
* Iridium alloy has an extremely high melting point, perfect for today’s high-tech performance engines.
* "Trivalent Metal Plating" provides superior anti-corrosion and anti-seizing properties.
* Outstanding acceleration, fuel efficiency, and durability.
554: 5K Ohm
Center Electrode Core Material: Copper Core
Center Electrode Tip Material: Iridium
Gap Size: 0.044
Ground Configuration: Standard
Ground Electrode Core Material: Nickel Core
Ground Electrode Quantity: 1
Ground Electrode Tip Design: Taper Cut
Hex Size: 5/8in
Insulator Height: ISO
Manufacturer Heat Range: 6
Resistance: 5K Ohm
Seat Type: Gasket
Thread Diameter: 14