HKS Spark Plugs

Part #: 50003-MR45HLZ

Overview

The HKS M12 Long Reach High Heat Range Spark Plug is a high-performance ignition component designed for enthusiasts seeking reliable and efficient spark delivery in their Honda Civic Type-R (17-21) and other compatible vehicles. Engineered with a protruding electrode and Ruthenium alloy, this spark plug offers enhanced durability, extended service life, and consistent ignition performance. It is ideal for drivers who push their vehicles with increased boost or light tuning, ensuring optimal combustion and engine responsiveness. Whether you're upgrading for improved reliability or supporting a tuned engine, this spark plug helps maintain peak engine performance and smooth operation.

Key Features

This spark plug combines advanced materials and thoughtful design to deliver dependable ignition performance. Key features include:

• Protruding electrode for improved ignition efficiency
• Ruthenium alloy construction for enhanced durability and longevity
• High heat range designed to withstand elevated combustion temperatures
• Long reach design for proper fitment in specific engine configurations
• Optimized for vehicles with increased boost or mild tuning
• Consistent spark delivery for reliable engine starts and smooth running
• Supports extended service intervals with high-quality materials

Construction & Design

The spark plug features a Ruthenium alloy electrode, which provides excellent wear resistance and stable performance over time. Its long reach design ensures proper seating in engines requiring extended thread length, promoting optimal heat dissipation and combustion efficiency. The protruding electrode enhances ignition response, especially in high-performance applications, helping to improve throttle response and engine smoothness.

Driving Feel & Feedback

Designed to support high-performance engines, this spark plug helps deliver consistent ignition sparks that contribute to improved throttle response and engine responsiveness. Drivers may notice smoother acceleration and more reliable starts, especially under demanding conditions or after tuning modifications.

Installation & Fitment

Installation requires verifying compatibility with your specific vehicle model and engine configuration. The long reach design should be matched to the engine's specifications to ensure proper fitment and performance. Always follow manufacturer torque specifications during installation to avoid damage.

What’s Included

The package includes a set of high-quality M12 long reach spark plugs, ready for installation in compatible Honda Civic Type-R models and other vehicles requiring this specific thread length and heat range.