HKS Super Fire Racing M40i Performance Spark Plug — Universal High-Output Ignition

SKU: HKS50003-M40I
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Sale price$283.50
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About HKS

HKS engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full HKS lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Unmatched Ignition Quality with HKS M40i

The HKS Super Fire Racing M40i spark plug is a top-tier choice for performance-oriented drivers who refuse to settle for standard factory components. This plug is engineered to provide a robust, reliable spark that is essential for high-performance engine tuning. With its advanced iridium alloy construction, the M40i is built to resist the extreme heat and pressure found in high-compression and turbocharged engines, ensuring your vehicle performs at its peak.

Key Technical Benefits

  • Iridium Center Electrode: Enhances spark stability and longevity, even under heavy engine loads.
  • Optimized Electrode Gap: Precision-engineered to ensure a complete and efficient burn of the air-fuel mixture.
  • Advanced Thermal Management: Superior heat dissipation properties help prevent pre-ignition and engine knock.
  • Increased Durability: Designed to withstand the rigors of both street and track environments.

When you choose the HKS M40i, you are choosing a spark plug that has been rigorously tested to meet the demands of high-performance driving. Its ability to maintain a consistent spark under varying conditions makes it an ideal upgrade for those looking to improve throttle response, fuel efficiency, and overall power output. Whether you are running a stock engine or a modified setup, the M40i provides the reliability you need to push your car to the limit with confidence. Experience the precision and power of HKS engineering in your own vehicle. Find all your performance ignition needs at GGCRACING.

Product Details

Product Description
Part Numbers
Sizing & Fit

About HKS

HKS engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full HKS lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Unmatched Ignition Quality with HKS M40i

The HKS Super Fire Racing M40i spark plug is a top-tier choice for performance-oriented drivers who refuse to settle for standard factory components. This plug is engineered to provide a robust, reliable spark that is essential for high-performance engine tuning. With its advanced iridium alloy construction, the M40i is built to resist the extreme heat and pressure found in high-compression and turbocharged engines, ensuring your vehicle performs at its peak.

Key Technical Benefits

  • Iridium Center Electrode: Enhances spark stability and longevity, even under heavy engine loads.
  • Optimized Electrode Gap: Precision-engineered to ensure a complete and efficient burn of the air-fuel mixture.
  • Advanced Thermal Management: Superior heat dissipation properties help prevent pre-ignition and engine knock.
  • Increased Durability: Designed to withstand the rigors of both street and track environments.

When you choose the HKS M40i, you are choosing a spark plug that has been rigorously tested to meet the demands of high-performance driving. Its ability to maintain a consistent spark under varying conditions makes it an ideal upgrade for those looking to improve throttle response, fuel efficiency, and overall power output. Whether you are running a stock engine or a modified setup, the M40i provides the reliability you need to push your car to the limit with confidence. Experience the precision and power of HKS engineering in your own vehicle. Find all your performance ignition needs at GGCRACING.

Product Details

Product Description

About HKS

HKS engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full HKS lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Unmatched Ignition Quality with HKS M40i

The HKS Super Fire Racing M40i spark plug is a top-tier choice for performance-oriented drivers who refuse to settle for standard factory components. This plug is engineered to provide a robust, reliable spark that is essential for high-performance engine tuning. With its advanced iridium alloy construction, the M40i is built to resist the extreme heat and pressure found in high-compression and turbocharged engines, ensuring your vehicle performs at its peak.

Key Technical Benefits

  • Iridium Center Electrode: Enhances spark stability and longevity, even under heavy engine loads.
  • Optimized Electrode Gap: Precision-engineered to ensure a complete and efficient burn of the air-fuel mixture.
  • Advanced Thermal Management: Superior heat dissipation properties help prevent pre-ignition and engine knock.
  • Increased Durability: Designed to withstand the rigors of both street and track environments.

When you choose the HKS M40i, you are choosing a spark plug that has been rigorously tested to meet the demands of high-performance driving. Its ability to maintain a consistent spark under varying conditions makes it an ideal upgrade for those looking to improve throttle response, fuel efficiency, and overall power output. Whether you are running a stock engine or a modified setup, the M40i provides the reliability you need to push your car to the limit with confidence. Experience the precision and power of HKS engineering in your own vehicle. Find all your performance ignition needs at GGCRACING.

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