Subaru NGK Spark Plugs

NGK Spark Plugs for Subaru

The plugs we run in our own builds, in the heat ranges we actually recommend: stock-heat-range iridium and ruthenium for daily drivers, one-step-colder iridium for boosted and built engines, and R2558E-9 racing plugs for serious power.

Where to start

  • EJ20 WRX (2002–2005): BKR7EIX, one step colder iridium
  • EJ25 WRX / STI (2006–2021): LFR7AIX, one step colder iridium
  • FA20 DIT WRX / Forester XT: ILKAR8H6 OEM replacement
  • FA20 BRZ / FR-S / 86, FB Crosstrek / Forester / Impreza: OEM-spec iridium and ruthenium replacements

Rule of thumb: go one step colder when you add boost, a tune or E85; stay at stock heat range on a stock car. Fitment, gap and torque are on each product page. Replacing plugs during a short block install? The right ones are already in our install kits.

Built in-house

Engines assembled at our East Coast facility. Parts designed, tested, and proven on our own cars — including the Gymkhana builds.

Support from the builders

Questions go to the people who made the part, not a call center. Contact us — a real person answers.

Backed in writing

Engines carry 1 year / 12,000 miles. AOS carries a limited lifetime warranty. Extended engine coverage is available.