COBB Spark Plug Set One Step Colder (D44700) | Subaru WRX 2006-2014 / STI 2004-2021 / Forester XT 2004-2008 / Legacy GT 2005-2009 / Outback XT 2005-2009

The COBB Spark Plug Set One Step Colder (D44700) supplies a factory‑grade, high‑performance ignition upgrade for a wide range of turbo Subaru platforms. This set uses a cooler heat range and tighter gap than many stock plugs, giving tuned or modified EJ‑series Subarus improved resistance to heat‑related issues while maintaining excellent ignition quality.

KEY FEATURES

• One‑step colder heat range than many factory plugs for better tolerance to higher combustion temperatures
• Laser‑welded iridium center electrode for strong, long‑lasting spark performance
• Tighter, precise gap to enhance ignition reliability under boost or higher‑load operation
• Direct‑fit set of four plugs, sold together no guessing on part numbers or gaps
• Designed as a straightforward upgrade for performance or tuned applications, and for higher‑stress driving
• Compatible with many COBB power or tuning packages where a cooler plug is recommended

TECHNICAL SPECIFICATIONS

• Electrode: iridium‑tipped, laser‑welded center electrode for durability
• Plating: trivalent metal plating for corrosion resistance and clean thread engagement
• Gap: 0.024 in / 0.6 mm, set for optimal spark performance on the targeted vehicles and applications
• Heat range: 7, one step cooler than typical stock plugs for these platforms
• Sold as a set of four plugs for complete engine service

VEHICLE FITMENT

• Subaru WRX 2006–2014
• Subaru STI 2004–2021
• Subaru Forester XT 2004–2008
• Subaru Legacy GT 2005–2009
• Subaru Outback XT 2005–2009

COBB delivers proven, data-driven performance solutions engineered to optimize your Subaru with unmatched precision and reliability.