Maintain peak ignition performance in your Nissan or Infiniti VQ35HR engine with this 10-pack of HKS M-Series Super Fire Racing spark plugs. Engineered to match the factory stock heat range, these plugs provide a high-durability alternative to standard OE components, ensuring consistent spark delivery and improved resistance to fouling under both daily driving and spirited conditions.

The M-Series design utilizes specialized electrode geometry and high-strength materials to withstand the thermal stresses common in high-revving V6 engines. This bulk pack of 10 provides a complete service set for the VQ35HR platform with additional spares for future maintenance intervals.

• Manufacturer: HKS
• Series: M-Series Super Fire Racing
• Heat Range: Stock / Standard
• Engine Compatibility: Nissan/Infiniti VQ35HR
• Quantity: Set of 10 Spark Plugs

HKS Super Fire Racing M40G spark plugs are engineered to deliver consistent ignition performance in high-stress racing and tuned engine environments. Designed to withstand extreme cylinder pressures, these plugs provide superior heat dissipation to help prevent pre-ignition and ensure reliable combustion under heavy load and high-boost conditions. The M40G heat range is specifically suited for high-output applications that require a colder plug than factory specifications to maintain thermal efficiency.

• Brand: HKS
• Series: Super Fire Racing
• Model Number: M40G
• Quantity: Pack of 10
• Applications: High-performance and modified engines requiring colder heat ranges
• Engineered for improved ignition and anti-fouling resistance

HKS Super Fire Racing M40 spark plugs are high-performance ignition components engineered for modified engines and demanding racing conditions. This M-Series plug set features a 0.6mm iridium alloy center electrode that reduces voltage requirements while improving ignition performance and durability. The ground electrode incorporates a platinum square chip to resist wear and ensure a consistent spark gap over the life of the plug.

The M40 designation corresponds to a Heat Range 8 (NGK equivalent), providing superior heat dissipation to prevent pre-ignition in high-load scenarios. Built with a copper core for enhanced thermal conductivity and a nickel-plated housing for corrosion resistance, these plugs are designed to maintain stability even under extreme combustion temperatures.

• Series: Super Fire Racing M-Series
• Heat Range: M40 (Heat Range 8 Equivalent)
• Center Electrode: 0.6mm Iridium Alloy
• Outer Electrode: Platinum Square Chip
• Construction: Copper core for efficient heat transfer
• Quantity: Set of 10 Spark Plugs

HKS M-Series Super Fire Racing spark plugs are engineered for high-performance engines that demand consistent ignition under extreme conditions. This 10-pack provides a complete ignition refresh or a ready supply of spares for your track-side kit, ensuring your engine maintains peak combustion efficiency during spirited driving or competitive use.

• Brand: HKS
• Series: M-Series Super Fire Racing
• Application: General Application
• Quantity: Pack of 10

Designed to handle the increased heat and pressure of tuned and forced-induction powerplants, HKS M-Series plugs are a trusted choice in the performance community for their durability and resistance to carbon fouling. These plugs serve as a direct upgrade for enthusiasts looking to stabilize their spark and protect their engine from misfires in high-RPM environments.

HKS Super Fire Racing M35i spark plugs are engineered to withstand the extreme cylinder pressures and temperatures of high-performance and modified engines. This pack of 10 provides a complete ignition solution for high-cylinder-count builds or multiple service intervals, offering superior ignitability and durability compared to standard OE components.

The M-Series features a 0.6mm iridium alloy center electrode that reduces the voltage required for spark while significantly improving spark concentration. The ground electrode incorporates a platinum square chip to extend service life and ensure consistent firing under heavy load. Additionally, the outer electrode features a copper core to aid in heat dissipation, helping to prevent pre-ignition and fouling in demanding driving conditions.

• Part Number: M35i
• Quantity: Pack of 10
• Center Electrode: 0.6mm Iridium Alloy
• Ground Electrode: Platinum Square Chip
• Thread Size: 14mm
• Reach: 19mm
• Hex Size: 16mm
• Heat Range: HKS 7 (NGK 7 Equivalent)

Fits select 2007-2021 BMW models equipped with N20, N54, N55, S55, N63, and S63 engines. Designed for high-performance and tuned applications, these Dinan Iridium spark plugs provide superior heat management and ignition reliability. By utilizing an iridium electrode with a copper core, these plugs offer significantly higher melting points than standard copper or platinum alternatives, allowing for a colder operating temperature that resists pre-ignition under high boost or high load.

These Heat Range 9 plugs are optimized for hard-to-ignite fuels like ethanol and are an essential match for Dinan ignition coils. Depending on your engine, they provide a colder heat range than factory (1 step colder for N20, S55, N63, S63; 2 steps for N55; and 3 steps for N54) to ensure stable combustion in modified setups. Manufactured in the EU to precise tolerances, they feature a projected insulator design and a 14mm bi-hexagonal configuration for secure installation.

• Manufacturer Part Number: D640-0002
• Heat Range: 9 (Compatible with Bosch 3, Brisk 10, Champion 4, Denso 27, NGK 9)
• Material: Iridium electrode with Copper core and Ceramic insulator
• Thread Diameter: 12mm
• Thread Reach: 26.5mm
• Hexagon: 14mm Bi-Hex
• Supplied Gap: 0.5mm
• Installation Torque: 17 Nm
• Terminal/Seat Type: Nut / Flat

Fits select 2007-2026 BMW, Mini, and Toyota models equipped with B48, B58, and S58 engines. This Dinan Iridium Spark Plug is a high-performance upgrade designed for tuned and stock applications alike, specifically those utilizing hard-to-ignite fuels like ethanol.

Constructed with an iridium electrode and a copper core, these plugs offer superior heat dissipation and higher resistance to melting or cracking compared to standard silver or platinum alternatives. Running one step colder than the original equipment (Gen 1 B48, Gen 1/2 B58, and S58), this plug helps lower operating temperatures and resists pre-ignition under high-load conditions. The iridium center electrode requires less voltage to produce a reliable, strong spark, ensuring consistent ignition performance.

• Heat Range: 9 (Comparable to NGK 9, Denso 27, Bosch 3)
• Thread: 12mm diameter x 26.5mm reach
• Hexagon: 14mm Bi-Hex
• Seat Type: Flat
• Gap: 0.5mm pre-set
• Insulator: Ceramic, projected design
• Terminal: Cup type
• Installation Torque: 17 Nm
• Manufactured in the EU

Fits select 2012-2026 Audi, Volkswagen, Bentley, and Porsche models.

The APR Iridium Pro Spark Plug (Heat Range 9) is a precision-engineered ignition upgrade specifically developed for high-performance and tuned engines. These plugs are designed to handle the increased heat and cylinder pressures found in high-boost applications, providing a cooler operating temperature than factory components to help prevent pre-ignition. The iridium electrode features a melting point 152% higher than silver and 38% higher than platinum, ensuring long-term durability under extreme thermal loads.

Featuring a non-projected insulator design, these plugs are optimized for hard-to-ignite fuels like ethanol. They serve as a direct-fit upgrade to support smoother idle stability and sharper throttle response. For maximum performance, pair these with APR high-output ignition coils to ensure a stronger, more consistent spark across the entire RPM range.

• Manufacturer Part Number: Z1003100
• Heat Range: 9 (Cross-reference: Bosch 3, Brisk 10, Denso 27, NGK 9)
• Thread Diameter: 14mm
• Thread Reach: 26.5mm
• Hexagon (Hex): 16mm
• Seat Type: Gasket
• Installation Torque: 25 Nm
• Construction: High-strength Iridium electrode with non-projected insulator
• Manufacturing: Made in the EU

Protect your ignition system from extreme under-hood temperatures with the Kooks Universal Spark Plug Sleeve Set. These heat shields provide a critical thermal barrier between your high-performance headers and spark plug boots, preventing the heat-soak, melting, and ignition misfires often caused by radiant exhaust heat.

Handcrafted in the USA, this set of eight sleeves is designed for universal application, ensuring compatibility with various wire diameters and boot angles across street, race, and off-road builds. The natural finish features the red Kooks logo, maintaining a clean look while providing the durability required for racing environments.

• Protects spark plug boots and wires from intense header heat
• Universal fitment for most spark plug boot configurations
• Natural finish with red Kooks logo branding
• Set of 8 sleeves included
• MPN: 750201
• Handcrafted in the USA
• Limited lifetime warranty to the original purchaser

The HKS Super Fire Racing MR45HLZ (50003-MR45HLZ-1) is a high-performance spark plug engineered for tuned engines requiring superior thermal resistance and ignition reliability. As part of the HKS Super Fire Racing series, this plug is designed to handle the increased combustion pressures and temperatures found in forced induction or high-compression powerplants.

• Enhanced Ignition: Features a 0.6mm iridium alloy center electrode for a concentrated spark and reduced voltage requirements, improving throttle response.
• Platinum Tip: The outer electrode incorporates a platinum chip to improve longevity and resist electrode wear under extreme racing conditions.
• Optimized Heat Range: The HKS "45" heat range provides excellent heat dissipation to prevent pre-ignition while maintaining resistance to carbon fouling.
• High-Strength Construction: Built with a nickel-plated housing to prevent seizing and corrosion in the cylinder head.
• MPN: 50003-MR45HLZ-1

This is a single replacement spark plug. Please verify your engine's specific gap and heat range requirements prior to installation.

The HKS Super Fire Racing M45iL is a high-performance spark plug engineered to handle the increased thermal loads of tuned or high-output engines. As part of the HKS M-Series, this plug is designed for improved ignition performance, enhanced durability, and superior anti-fouling characteristics. It features a 0.6mm iridium alloy center electrode that reduces voltage requirements while ensuring a consistently strong spark for more efficient combustion.

Built for extreme environments, the platinum ground electrode provides exceptional longevity and reliable operation under high boost and high RPM conditions. The outer shell is finished with nickel plating for corrosion resistance, making it a robust choice for specialized performance applications.

• Manufacturer Part Number: 50003-M45IL-1
• HKS Heat Range: 45 (NGK 9 Equivalent)
• Reach/Type: iL Type (Long Reach)
• Electrode Material: 0.6mm Iridium alloy center / Platinum ground
• Quantity: Sold individually

The HKS Super Fire Racing M45i is a high-performance Iridium spark plug designed to deliver superior ignition reliability in demanding environments. Engineered for tuned engines, the M-Series plugs are built to withstand the increased combustion pressures and temperatures associated with performance modifications.

• Manufacturer Part Number: 50003-M45I-1
• Plug Series: Super Fire Racing M-Series
• Plug Type: ISO Type
• Heat Range: HKS 45
• Core Material: Iridium
• Quantity: Sold individually

This ISO-type spark plug is designed to improve throttle response and resist carbon fouling. The high-strength construction ensures a stable spark under high-load conditions, making it an essential upgrade for forced induction or high-RPM naturally aspirated setups.

The HKS Super Fire Racing M45G is a high-performance spark plug engineered to withstand the extreme cylinder pressures and temperatures found in modified and racing engines. Designed for drivers demanding reliable ignition, these plugs offer superior durability and heat dissipation compared to standard OE components.

HKS Super Fire Racing plugs utilize a specialized electrode design to optimize spark delivery and prevent fouling during high-load operation. The M45 heat range is specifically suited for high-performance applications where thermal management is critical to preventing pre-ignition and maintaining power consistency across the RPM range.

• Manufacturer Part Number: 50003-M45G-1
• Series: Super Fire Racing
• Heat Range: M45
• Plug Type: G-Type electrode
• Quantity: Single spark plug
• Optimized for high-performance street and track use

The HKS Super Fire Racing M45 is a high-performance spark plug engineered to handle the increased thermal and mechanical stresses of tuned engines. Designed for drivers demanding more from their ignition system, the M-Series provides improved durability and more consistent spark delivery compared to standard factory components.

• Manufacturer Part Number: 50003-M45-1
• Product Series: Super Fire Racing M-Series
• Heat Range: M45 (NGK 9 equivalent)
• Quantity: Single Spark Plug

Whether you are replacing worn plugs or upgrading for a high-boost application, these Super Fire Racing plugs are built to resist fouling and provide reliable ignition during high-RPM operation. This is a single replacement unit; please verify the required quantity for your specific engine configuration.

The HKS Super Fire Racing M40 is a high-performance M-Series spark plug engineered to withstand the increased thermal loads and cylinder pressures of tuned or forced-induction engines. It features a 0.6mm iridium alloy center electrode that reduces voltage requirements while improving ignition performance and durability under extreme conditions.

Built for high-stress environments, the Super Fire Racing series incorporates a platinum square chip on the ground electrode to ensure long-term reliability and consistent spark delivery. The M40 heat range (equivalent to an NGK 8) provides the superior anti-fouling and pre-ignition resistance necessary for high-output applications.

• Brand: HKS
• Series: Super Fire Racing M-Series
• Part Number: M40
• Electrode Material: Iridium alloy center with platinum ground chip
• Heat Range: HKS 40 (NGK 8 Equivalent)
• Thread/Reach/Hex: 14mm x 19mm x 16mm
• Quantity: Single (1) Spark Plug

Fits select 2011-2021 Ford F-150 and Mustang models (5.0L).

Engineered by Ford Performance for high-output applications, this cold spark plug set is designed to manage the increased cylinder temperatures associated with performance tuning. These plugs are a heat range colder than the factory original equipment, providing better heat dissipation and helping to prevent pre-ignition or detonation in demanding conditions.

This set is an essential upgrade for 5.0L Coyote engines running forced induction (superchargers or turbochargers), nitrous oxide, or aggressive aftermarket ECU calibrations. By pulling heat away from the combustion chamber more efficiently, these plugs ensure consistent ignition timing and reliable power delivery during high-load operation.

• Optimized for performance 5.0L Coyote engines
• One heat range colder than stock to prevent pre-ignition
• Ideal for forced induction and high-compression builds
• Direct-fit installation for 2011-2021 Mustang GT and 2011-2018 F-150 5.0L
• Manufacturer Part Number: M-12405-M50A
• Includes a complete set of 8 spark plugs

Fits select 2021-2025 Ford F-150 and Mustang models (5.0L).

Ensure reliable ignition in high-performance environments with this Ford Racing Cold Spark Plug Set. Engineered specifically for 5.0L Coyote engines equipped with variable displacement, these plugs feature a colder HR8 heat range. This makes them a critical upgrade for supercharged applications where managing combustion chamber temperatures is essential to preventing pre-ignition and detonation.

• Manufacturer Part Number: M-12405-50VDE
• Heat Range: Colder HR8 (Recommended for supercharger applications)
• Thread Diameter: 12mm
• Recommended Gap: 0.32 in. gap for supercharged setups
• Quantity: Set of 8

These plugs are designed to handle the increased cylinder pressures and heat associated with forced induction, providing a more robust spark path and improved thermal capacity compared to standard heat range plugs.

Fits select 2010-2019 Ford F-150, Flex, and Taurus models (2.3L / 2.7L / 3.5L).

This Ford Performance Cold Spark Plug Set is engineered for high-output EcoBoost engines that require improved thermal management. Running one heat range colder than the factory equipment helps prevent pre-ignition and detonation, making these plugs an essential upgrade for vehicles with increased boost levels or performance tuning.

• Manufacturer Part Number: M-12405-35T
• Heat Range: One range colder than stock OE plugs
• Quantity: Set of 6
• Pre-Gap: Factory gapped to .031 in. (0.79mm)
• Compatibility: Designed for Ford EcoBoost 2.3L, 2.7L, and 3.5L engines

Each plug is built to Ford Performance standards to ensure reliable ignition and consistent performance under the higher cylinder pressures common in modified turbocharged applications.

The Bosch ZR5TPP33 Suppressed Spark Plug is a precision-engineered ignition component designed to provide consistent combustion performance while protecting your vehicle's sensitive electronics. Featuring an integrated suppression resistor, this plug effectively manages Radio Frequency Interference (RFI) to ensure clear operation of onboard communication and engine management systems.

• Manufacturer Part Number: 0242145515
• Series: ZR5TPP33
• Built-in suppression resistor eliminates electronic noise and interference
• Engineered to meet or exceed original equipment standards for fit and function
• Durable construction designed for long-term reliability in high-temperature engine environments
• Optimized electrode design for efficient spark delivery

Maintain optimal ignition performance in your turbocharged Subaru with this set of four Cobb spark plugs. Specifically gapped and heat-ranged for the 2.5L flat-four engine, these plugs provide the consistent spark needed for high-performance applications and modified setups. Note: This specific 4-pack is designed for purchase exclusively alongside Cobb Power Packages to ensure proper system calibration.

• Direct fit for select Subaru WRX, STI, Legacy GT, and Forester XT (FXT) models.
• Optimized for the Subaru 2.5L turbocharged engine platform.
• Complete set of four (4) spark plugs for a full service.
• Essential component for maintaining combustion stability under increased boost.
• Manufacturer Part Number: D44700