NGK Iridium Spark Plugs Stock Heat LFR6AIX Subaru 2006-2014 WRX / 2004-2021 STI

The NGK 6619 (part number LFR6AIX-11) is a high-performance Iridium IX spark plug designed for enthusiasts, featuring a fine iridium center electrode for stable sparks, improved acceleration, fuel efficiency, and durability, with a tapered ground electrode for better flame expansion, making it ideal for modern high-performance engines.

Features:
- Material: Iridium fine-wire center electrode, six times harder than platinum, offering extreme durability and ignitability.
- Performance: Delivers outstanding acceleration, better throttle response, and superior anti-fouling.
- Design: Tapered cut ground electrode for faster flame expansion; reduced quenching design for ignitability.
- Engine Benefits: High melting point of iridium suits high-temperature engines; pure copper core for heat dissipation.
- Corrosion Resistance: Trivalent metal plating offers superior anti-corrosion and anti-seizing properties.
- Stock Heat Range / OEM Replacement

Specifications:
- Thread Size = 14mm
- Hex Size = 5/8" (16mm)
- Reach = 26.5mm (1.04")
- Seat Type = Gasket
- Gap = .044"
- Heat Range = 6
- Terminal Type = Non-Removable Nut
- Resistor = Yes

Notes:
Sold as a set of 4

Applications:
2006-2007 Subaru WRX
2004-2007 Subaru STI
2008-2014 Subaru WRX
2008-2014 Subaru STI
2015-2021 Subaru STI
2004-2014 Subaru Forester
2004-2014 Subaru Impreza