SKU: 51847930518

HKS Super Fire Racing Spark Plug 50003-M40XL

$38.85 $43.17
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Ships within 48 hours · Estimated delivery Sep 19 - Sep 24

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Description

HKS Super Fire Racing Spark Plug 50003-M40XLM Series Super Fire Spark Plugs HKS M Series spark plugs are high performance Iridium plugs designed to provide improved ignition performance, durability and anti carbon build up. 0. 6mm Iridium Alloy Center Electrode Outer Electrode with Platinum Chip Short Type Outer Electrode (Anti Vibration) Thermal Edge Spark Support Gap M Series is recommended for reliable ignition, durability and anti carbon buildup under high load. The Iridium alloy is used

M-Series Super Fire Spark Plugs

HKS M-Series spark plugs are high performance Iridium plugs designed to provide improved ignition performance, durability and anti-carbon build-up.

  • 0.6mm Iridium Alloy Center Electrode
  • Outer Electrode with Platinum Chip
  • Short Type Outer Electrode (Anti-Vibration)
  • Thermal Edge
  • Spark Support Gap

M Series is recommended for reliable ignition, durability and anti-carbon buildup under high load.

The Iridium alloy is used because of its durability and reliability.  On an average plug, a narrow core typically shortens life span of plug but with the intense durability of iridium there is no sacrifice in any longevity.  With a high melting point of 2454 degrees C, opposed to the 1769 degrees C of white gold, the electrode can tolerate the high levels of compression and minor knocking without any deterioration. A nickel coating on the housing also prevents the spark plug from premature deterioration.  The Iridium plugs are available for multiple applications and offered in "colder" heat ranges of 7 and up and specifically for rotary, heat ranges of 9 and up are offered.

Heat Range: NGK # 8
Thread Size: 12mm × 26.5mm
Wrench Size: 16mm

Fits:

2014 - 2015 ACURA RLX ALL 3.5 ELECTRIC/GAS JNB1 From 1/2015 Production Date  KC2 Chassis  HYBRID  Stock Plug/Heat Range: M12 Long Reach Hex16:7
2008 - 2012 HONDA ACCORD L4 2.4 ALL K24Z2 From 12/2008 Production Date  CU2 Chassis  i-VTEC  Stock Plug/Heat Range: M12 Long Reach Hex16:7
2008 - 2008 MERCEDES-BENZ C300 ALL 3.0 ALL ALL From 6/2007 Production Date  DBA-204054 Chassis  Stock Plug/Heat Range: M12 Long Reach HEX16:7
2007 - 2015 MINI COOPER ALL 1.6 ALL ALL From 2/2007 Production Date  ABA-MF16 Chassis  Stock Plug/Heat Range: M12 Long Reach HEX16:6
2008 - 2014 MINI COOPER ALL 1.6 ALL ALL From 10/2007 Production Date  Stock Plug/Heat Range: M12 Long Reach HEX16:6
2007 - 2015 MINI COOPER ALL 1.6 ALL ALL From 2/2007 Production Date  ABA-MF16S Chassis  Stock Plug/Heat Range: M12 Long Reach HEX16:7
2008 - 2014 MINI COOPER ALL 1.6 ALL ALL From 10/2007 Production Date  Stock Plug/Heat Range: M12 Long Reach HEX16:7
2008 - 2015 MITSUBISHI LANCER ALL 2.0 ALL 4B11 From 10/2007 Production Date  CZ4A Chassis  DOHC MIVEC  Stock Plug/Heat Range: M12 Long Reach HEX16:8
2007 - 2012 MITSUBISHI OUTLANDER ALL 3.0 ALL 6B31 From 9/2007 Thru 10/2012 Production Date  CW6W Chassis  Stock Plug/Heat Range: M12 Long Reach HEX16:7
2012 - 2012 MITSUBISHI OUTLANDER ALL 2.4 ALL 4B12 From 10/2012 Production Date  GF8W Chassis  Stock Plug/Heat Range: M12 Long Reach HEX16:6
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 51847930518

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Mariel
Port Orchard, US
★★★★★ 5
Well made, light fabric. Waist doesn't roll.
These bamboo underwear really do keep you cool. They fit true to size, and wear easily. the wide elastic waist band doesn't roll on me. They are comfortable to wear, washed and dried easily. The material has some stretch to it, but not a lot. Well made, no stray strings. Perfect fit for me. Just what I was looking for.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 17, 2026
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Finngirl
Whiting, US
★★★★★ 5
Good quality, smooth feel
I got these briefs so recently that have washed just one pair so far. First off, these are very comfortable, the material is soft & bordering silky, good quality sewing. Wash well and minimal if any shrinkage. They do come a bit wrinkled from the dryer but hey, these are underwear and will go on smoothly. If it were a t-shirt, I would look sloppy. I feel the sizing is accurate. No rolling and these don't announce themselves under clothing. Planning on getting more of these boxers and replacing my old panties.
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Reviewed in the United States on January 31, 2026
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Skurtzo
Boise, US
★★★★★ 4
A little snug on the thighs
Size: Medium, Color: Multicoloured G (5-pack)
Super comfy, soft and thin. For reference, I'm 5'6", 135, athletic build. I bought medium. I almost returned them because I thought they were a bit too snug on my thighs, and my thighs are not large at all. I was concerned about panty lines under snug clothing. But, because they're thin, I figured they would probably stretch, so I kept them. So far, I've only worn them under a night shirt, but they're super comfortable and they dont ride up at all. Very nice, but if your thighs are a little thick, you probably won't like them.
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Reviewed in the United States on August 29, 2025
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Shanna
Grantham, US
★★★★★ 5
Functional + Sexy
Size: Small, Color: Multicoloured E-(5-pack), Size: Small, Color: Multicoloured E-(5-pack)
Not only do these feel good, my husband can’t keep his hands off me. They fit so good and are soft. I change into these to sleep but also just use them as shorts to wear around the house. They’re comfortable and don’t slide around. I got a size small and I’m 100lbs.
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Reviewed in the United States on April 13, 2026
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ClairY
Grantham, US
★★★★★ 5
Finally!
Size: X-Large, Color: All Black D (5-pack)
Finally, comfortable underwear that don’t end up giving me a wedgie. I have a round booty and most cuts of underwear end up shifting as I walk and sit. The hem of the underwear comes right under my cheeks and the lightweight material ensures there’s no panty line and no shifting to where I don’t want them! I’m definitely purchasing more.
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Reviewed in the United States on May 17, 2026

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