HKS HKS SUPER FIRE RACING M45iL - Single
HKS HKS SUPER FIRE RACING M45iL - Single
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HKS SUPER FIRE RACING M45iL - Single

HKS
HKS50003-M45IL-1
Spark Plugs
20+ Units In Stock - Ships Next Business Day
Engine, HKS, Ignition, Spark Plugs
$ 27.00
$ 27.00

SKU: 50003-M45IL-1

HKS SUPER FIRE RACING M45iL Spark Plug - Single for Subaru Impreza WRX STI 2004-2021 Legacy GT 2005-2009

HKS Super Fire Racing M45iL is a single iridium spark plug engineered for high-revving performance engines. It fits Subaru Impreza WRX STI Forester XT Legacy GT Nissan 350Z G35 Mazda RX-8 and more delivering sharper ignition for improved throttle response combustion efficiency and horsepower. Replace worn plugs to restore peak engine performance and reliability in turbocharged setups.

Key Features

  • 0.8mm Pure Iridium Tip: Provides focused spark concentration for reliable ignition even at 10,000+ RPM reducing misfires in demanding racing conditions.
  • 45mm Reach 14mm Thread: Exact OEM-spec dimensions ensure drop-in compatibility with gasket seat design for secure seal and heat dissipation.
  • V-Grooved Ground Electrode: Creates air turbulence around the spark improving flame kernel growth for fuller combustion and power output.
  • Projected Insulator: Resists carbon fouling and maintains consistent heat range during extended track sessions.
  • High Thermal Conductivity: Pure iridium alloy withstands extreme cylinder temperatures for longer lifespan versus copper or platinum plugs.

Product Notes

  • Sold as single plug. Order quantity needed for full engine set (4 or 6 depending on model).
  • Pre-gapped to 0.8mm. Verify and adjust if necessary before installation.
  • Store in original packaging to protect fine tip from damage.

Installation Notes

  • Professional installation recommended.
  • Torque to 18-22 ft-lbs using thin-wall deep socket to avoid insulator damage.
  • Apply anti-seize compound to threads. Compatible with stock coils and wiring.

This Part Fits

Year Make Model Submodel
2004-2021 Subaru Impreza WRX STI 2.5L
2008-2014 Subaru Impreza WRX 2.5L
2008-2012 Subaru Forester XT 2.5L
2005-2009 Subaru Legacy GT 2.5L
2005-2009 Subaru Outback XT 2.5L
2003-2008 Nissan 350Z 3.5L V6
2003-2007 Nissan G35 3.5L V6
2004-2011 Mazda RX-8 1.3L Rotary
2003-2005 Mitsubishi Lancer Evolution Evo 8 2.0L
2006-2007 Mitsubishi Lancer Evolution Evo 9 2.0L

Why Choose HKS?

  • 45+ years of motorsport development powers real-world track-proven components.
  • Japanese manufacturing ensures tight tolerances and consistent quality.
  • Engineered specifically for boosted and high-output engines like EJ25 and VQ35.

Frequently Asked Questions

  • Q: Will this fit my 2008+ Subaru WRX STI?
    A: Yes it directly replaces OEM plug in all 2.5L EJ25 turbo models from 2004-2021 with 14mm x 45mm specs.
  • Q: What material is the center electrode?
    A: 99.9% pure iridium alloy with 0.8mm diameter for superior durability and spark focus versus standard nickel plugs.
  • Q: What is the warranty and gap setting?
    A: HKS offers limited warranty against defects. Ships pre-gapped at 0.8mm suitable for most performance tunes.

Shipping & Handling

  • Method: UPS Ground or USPS Priority
  • Availability: In stock - ships same or next business day
  • Packaging: Compact retail box 4 x 3 x 1.5 inches
  • Weight: 0.11 lbs

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