NGK Stock Heat Range Iridium IX Spark Plugs - Subaru EJ25 Turbo Models - 2004-2018 STI, 2006-2014 WRX, 05-09 LGT, 03-08 FXT, ECT.

Features:

• Sold as a set of 4 spark plugs
• Direct replacement
• Trivalent metal plating provides superior anti-corrosion and anti-seizing properties
• Corrugated ribs prevent flashover
• Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer
• Copper core aids in heat removal
• Triple seals prevent leakage
• Longevity: 50k Miles
• 60 Days manufacturer Warranty

Shell
Spark Plug Thread Diameter: 14mm
Thread Pitch: 1.25mm
Seat Type: Flat
Reach: 26.5mm (1.04")
Wrench Diameter: 5/8" (16mm)
Terminal Type: Solid

Center Electrode
Electrode Tip Material: Iridium
Electrode Core Material: Copper

Ground Electrode
Type: Standard
Shape: Taper Cut

Specifications
Resistor: Yes
Resistor Value: 5k Ohm
Manufacturer Heat Range: 6

• NGK "6" indicates this is a stock heat range spark plug used for all EJ255/EJ257 stock engines.

• For tuned vehicles NGK "7" heat range is the One Step (1-Step) colder spark plug #LFR7AIX can be found HERE.
• Iridium plugs are able to use larger gap setting with less voltage. Some customers choose to regap these plugs to correct misfiring or tune for optimal spark -- do so at your own risk -- slide-type plug gapper will damage the fragile iridium tip

• Sold as a set of 4