NGK Spark Plugs (2309 One Step Colder)

Fitment Information:

2006-2014 Subaru WRX

2004-2021 Subaru STI

2005-2009 Subaru Legacy GT

2003-2008 Subaru Forester XT

Features:

• Sold as a set of 4 spark plugs
• 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
Gap: .031" (0.8mm)

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

Ground Electrode
Material: Nickel
Type: Standard
Shape: Taper Cut

Specifications
Resistor: Yes
Resistor Value: 5k Ohm
Manufacturer Heat Range: 7
Torque Specs: Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.