SKU: 50003-M45IL | UPC: 4957266720288
HKS SUPER FIRE RACING M45iL Spark Plug for Subaru Impreza WRX STI 2002-2021
The HKS Super Fire Racing M45iL is an iridium spark plug built for high-performance Subaru engines. It fits Impreza WRX and STI models from 2002 to 2021 with EJ20 and EJ25 turbo setups. This plug provides reliable spark at 12000 RPM and above for consistent power delivery and reduced misfires.
Key Features
- 0.6mm Iridium Center Electrode: Focuses energy into a pinpoint spark for complete combustion in high-compression turbo engines
- Platinum Ground Electrode Pad: Resists erosion during extended high-heat operation to maintain gap and performance over time
- Racing Heat Range M45: Balances heat dissipation to avoid pre-ignition while clearing deposits in boosted applications
- M12x1.25 Thread 26.5mm Reach: Matches OEM dimensions for drop-in installation without adapter or modification
- 14mm Hex Design: Allows use of standard socket tools and works with factory ignition coils
Product Notes
- Sold individually. order four for inline-four engines or six for boxer-six
- Factory gapped at 0.8mm. verify with feeler gauge before install
- Compact packaging ships via padded envelope
Installation Notes
- Professional installation recommended.
- Torque to 18-22 ft-lbs using anti-seize on threads
- Compatible with OEM HKS coil-on-plug systems
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2002-2007 | Subaru | Impreza | WRX |
| 2004-2007 | Subaru | Impreza | WRX STI |
| 2008-2014 | Subaru | Impreza | WRX STI |
| 2015-2021 | Subaru | WRX | STI |
Why Choose HKS?
- Developed for JDM rally and circuit cars since 1973
- Tested in professional Subaru motorsport applications
- Engineered in Japan with strict tolerances for reliability
Frequently Asked Questions
- Q: Does this fit all Subaru WRX STI models from 2002-2021?
A: Yes it matches EJ207 EJ255 and EJ257 engines in USDM Impreza WRX and STI chassis including hatchback sedan and wagon variants - Q: What material makes up the center electrode?
A: Pure iridium alloy at 0.6mm diameter for superior durability and spark focus compared to standard nickel plugs - Q: What is the warranty and return policy?
A: HKS offers a one-year limited warranty against defects. returns accepted within 30 days unused
Shipping & Handling
- Method: UPS Ground
- Availability: In stock – ships same or next business day
- Packaging: 3.94 x 0.98 x 0.98 inches box
- Weight: 1.6 ounces
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