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Ships within 48 hours · Estimated delivery Jul 7 - Jul 12
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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:
- 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
4.7 ★★★★★
Based on 2263 reviews
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Product Reviews
★★★★★ 3
Not cooling
Size: Sapphire Queen
We have waited to give a review. These 2 pillows we purchased based off the good reviews and that it states has cooling effect.
Well a good point it has is the blend of stuffing. Also the ability to remove or add for your comfort. The softness/firmness is just right once you figure out your comfortable mix.
However with having foam and poly blend, there is no cooling. Those tiny blue specs do nothing but add color to stuffing. Both my husband an myself wake up because our head is hot. Moving around alot helps with that but doesn't offer a restful sleep.
I do like that it has a cover over the pillow so you have 2 zippers to go through to remove stuffing. This prevents waking with foam all over your bed.
Overall I would have given a better review if actually offered the cooling effect. I could have saved money an just purchased the cheaper pillow they offer.
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Reviewed in the United States on December 29, 2025
★★★★★ 5
Tired of bad sleep try this pillow :)
Size: Sapphire Queen
Never owned a nice or expensive pillow finally after a good 25 years of super cheap pillows finally decided to try a nice one and see if there is a big difference and see what all the woot is about anyways in my opinion I am a side sleeper and I now just use this instead of multiple pillows and I can safely say it works very well seems too cool a little and is very comfortable plus bonus they give you extra fluff if you want to add more or replace but straight out of the box was absolutely perfect for sleeping I am insanely picky about it will ABSOLUTELY BUY THIS AGAIN 🥰🥰🥰 firmness absolutely perfect as is
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Reviewed in the United States on March 29, 2026
★★★★★ 1
Flattened out a little over a month or using it
Size: Sapphire Queen
Figured I would wait a month or 2 before leaving a review. At first. The pillow was great. Very comfortable. Held up nice. Nice and firm and gave great support. After a month. It started to flatten out. Had to re-fluff it only to have flatted out faster this time. Now no matter how many times I fluff it. It doesn’t give the proper support any longer. I’ve bought 2 of these and they are identical. So it can’t be just a fluke for the 2 i have. I’m regretting the purchase as the price was fair when I bought them. But not any longer as they are not the same.
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Reviewed in the United States on January 26, 2026
★★★★★ 5
Amazing - Stop Scrolling and Buy This Pillow
Size: Queen (Pack of 1), Color: White
I have been an Amazon customer ever since the very beginning, and this is my first review. Not because I haven’t purchased tons of amazing things (and a few bad ones), just never felt the need.
However, I researched pillows for longer than I care to admit, and decided on this one.
I’ve had it for about six months and absolutely love it. No lie, I genuinely look forward lying my big head on it after a long day.
I am a side sleeper, but flip flop all around through the night and it’s great in every position.
Pros:
Stays nice and cool, which is soothing regardless of the time of year.
Has a sort of quilted textured pattern on the zip up cover, gives it a luxury feel, that breaths nicely even when a pillow case is added.
The fill is fully adjustable to your preference.
I knew it came with extra filling but was worried it would not be enough. Wrong. It was very full and I ended up taking some out until it was perfect.
It comes vacuum sealed and suggests it may take some time to fully take shape. However, I found it to be about 90% almost instantly and was sleeping on it a couple hours later.
There was no unpleasant scent sometimes associated with memory foam items.
The foam itself is very nice, a mix of what appears to be shredded and cotton candy cloud like. Very brilliant idea, as it is somehow supportive, soft and firm all at once.
The affordability of this pillow compared to some of the others in this category can’t be overstated.
Oh, and the packaging was very thoughtfully and securely done.
If you are like me, an over thinker, I would suggest just taking this for a spin. It’s amazing.
I’m not a bot, or working for the company. I’m just truly satisfied, love this pillow, and have been sleeping great.
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Reviewed in the United States on April 6, 2026
★★★★★ 5
It's the perfect pillow!
Size: Queen (Pack of 1), Color: White
I purchased this pillow specifically for its customizable fill feature, which allows you to add or remove stuffing to suit your personal comfort needs. Due to the unique curvature of my cervical spine—forward at the neck rather than backward—I require a soft, semi-flat pillow rather than one that is thick or firm. Additionally, I often experience ear discomfort by morning, so a gentler surface is essential.
Upon adjusting the fill, I was pleasantly surprised by the generous amount of stuffing included. There was enough to fill an additional pillowcase, and I estimate it could easily create four to five more pillows. The ability to modify the pillow’s firmness at any time is an outstanding feature that makes it adaptable for a wide range of preferences and sleep styles.
This pillow has exceeded my expectations in both comfort and versatility. I highly recommend it to anyone seeking a personalized sleep experience.
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Reviewed in the United States on February 1, 2026
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