SKU: 18257657724

HKS Super Fire Racing Spark Plug 50003-M40LF

$38.85 $43.17
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Ships within 48 hours · Estimated delivery Jul 16 - Jul 21

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Description

HKS Super Fire Racing Spark Plug 50003-M40LFM 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: 14mm × 25mm
Wrench Size: 16mm

Fits:

2006 - 2009 MAZDA 3 L4 2.0 ALL From 6/2006 Thru 6/2009 Production Date  BKEP Chassis  Stock Plug/Heat Range: Conical Long Reach:5
2006 - 2009 MAZDA 3 L4 2.3 ALL From 6/2006 Thru 6/2009 Production Date  BK3P Chassis  Stock Plug/Heat Range: Conical Long Reach:5
2009 - 2011 MAZDA 3 L4 2.0 ALL From 6/2009 Thru 8/2011 Production Date  BLEFP Chassis  Stock Plug/Heat Range: Conical Long Reach:6
2009 - 2013 MAZDA 3 L4 2.0 ALL From 6/2009 Thru 11/2013 Production Date  BLEAP Chassis  Stock Plug/Heat Range: Conical Long Reach:5
2007 - 2009 MAZDA 3 L4 2.3 MZR From 6/2006 Thru 6/2009 Production Date  BK3P Chassis  Stock Plug/Heat Range: Conical Long Reach:6
2009 - 2013 MAZDA 3 L4 2.3 MZR From 6/2009 Thru 11/2013 Production Date  BL3FW Chassis  Stock Plug/Heat Range: Conical Long Reach:6
2005 - 2007 MAZDA 6 L4 2.3 ALL From 6/2005 Thru 12/2007 Production Date  GG3P Chassis  Stock Plug/Heat Range: Conical Long Reach:5
2008 - 2012 MAZDA 6 L4 2.5 ALL From 1/2008 Thru 11/2012 Production Date  GH5FP/GH5AP Chassis  Stock Plug/Heat Range: Conical Long Reach:5
2006 - 2007 MAZDA 6 L4 2.3 MZR From 6/2005 Thru 12/2007 Production Date  GG3P Chassis  Stock Plug/Heat Range: Conical Long Reach:6
2007 - 2011 MAZDA CX-7 L4 2.3 MZR From 12/2006 Thru 12/2011 Production Date  ER3P Chassis  Stock Plug/Heat Range: Conical Long Reach:5
2006 - 2014 MAZDA MX-5 MIATA L4 2.0 ALL From 8/2005 Production Date  NCEC Chassis  Stock Plug/Heat Range: Conical Long Reach: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: 18257657724

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4.0 ★★★★★
Based on 18 reviews
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D
Verified Purchase
DeAnna
Phoenix, US
★★★★★ 5
Solid, Reliable, and Makes the Gross Job Way Easier
Style: 20' Rhino Sewer Hose
Solid, Reliable, and Makes the Gross Job Way Easier This is hands-down the best sewer hose kit I’ve used. It’s sturdy, easy to connect, and doesn’t feel flimsy like some of the cheaper ones. The clear elbow is a lifesaver because you can actually SEE when everything is done (which every RVer knows matters). The hose holds its shape, stretches exactly as needed, and packs up neatly. If you’re full-time or travel often, this is the one you want.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 5, 2025
A
Verified Purchase
Amazon Customer
Birmingham, US
★★★★★ 5
Best hoses out there
Style: 20' Rhino Sewer Hose
Great hoses. Extremely flexible yet sturdy. Manoeuvres around things easy. Perfect thickness without taking up a ton of space. Compatible with alot of accessories offered. No complaints
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 20, 2026
S
Verified Purchase
SELLWOOD
Lake Worth, US
★★★★★ 5
Worth the money. Get it.
Style: 20' Rhino Sewer Hose
I am a full time RV'er and these are the best hoses I have worked with. At this point I just do not buy anything else unless I have no choice. Yes, everything fails over time but these last the longest. If you want solid equipment you just don't have to worry about, get these hoses.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 7, 2026
D
Verified Purchase
douglas moyer
Chelsea, US
★★★★★ 5
Good product for the trip
Style: 20' Rhino Sewer Hose
Good product
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 12, 2026
M
Verified Purchase
Mike Hayward
Grantham, US
★★★★★ 4
Secure, clean hose, poor durability.
Style: 20' Rhino Sewer Hose
The connectors, and plugs work great. I operate an Arctic Fox 990 TC. Plugging the ends keeps any residual in the hose and prevents odors and they ends are very easy to operate. I operate an RV in a climate controlled environment, dumping grey water roughly once every day or two for odor control, with occasional trips dumping more like 5-7 day intervals. I only use one of the two hoses and after about 175 cycles the hose split apart near the end. I shortened it at the break and reattached but within another 10 uses the hose split in the middle. Extending and contracting the hose is hard on it and weakens the folds in the plastic the point of failure within certainly less than 200 uses at 50+F temperatures, so don't expect great longevity out of the hose. I image if you dump in cold temperature, subject it to a lot of movement by leaving it hooked up outside the hose could survive even fewer extensions. If you only dump a few times a year it may last you twenty years or more. The good news is that if you pay attention you'll likely notice the hose split before you run the sewage through it, so if you carry a spare you'll at least be able to dump. I ordered another pair so I can always have at least one spare on hand and I figure my failure rate will be about once every 9 months or so. Camco makes other hoses, including an Extreme that likely doesn't pack tightly enough for two 10' sections in my bumper. I don't need crush resistance, I need durability, so the more expensive hose really wouldn't be an improvement for me since I wouldn't be able to carry a backup. I'm guessing all of these hoses will have a similar durability limitation, especially if extended when cold. I'd like to see a slightly softer, more durable material that will still hold it's shape when dumping, but maybe that's not possible with current plastic characteristics. Main take away is make sure you've got a spare sewer hose section on hand if you have a way to store it.
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Reviewed in the United States on December 21, 2021

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