HKS Super Fire Racing Spark Plug 50003-M50RE
SKU: 49925089645

HKS Super Fire Racing Spark Plug 50003-M50RE

$70.93 $78.81
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Description

HKS Super Fire Racing Spark Plug 50003-M50REM 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 # 10
Thread Size: 14mm × 12.7mm
Wrench Size: 20.8mm

Fits:

1983 - 1985 MAZDA RX-7 ALL ALL From 10/1983 Thru 9/1985 Production Date  SA22C Chassis  Stock Plug/Heat Range: ROTARY:9
1985 - 1988 MAZDA RX-7 R2 1.3 From 10/1985 Thru 8/1988 Production Date  FC3S/FC3C Chassis  Stock Plug/Heat Range: ROTARY:10,11
1988 - 1991 MAZDA RX-7 R2 1.3 From 9/1988 Thru 12/1991 Production Date  FC3S/FC3C Chassis  Stock Plug/Heat Range: ROTARY:7,9
1993 - 1995 MAZDA RX-7 R2 1.3 From 12/1991 Thru 8/2002 Production Date  FD3S Chassis  Stock Plug/Heat Range: ROTARY:7,9
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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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: 49925089645

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4.7 ★★★★★
Based on 939 reviews
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Roger
Houston, US
★★★★★ 5
Shocked
Color: White, Size: Queen (Pack of 2)
I'm really bougie when it comes to pillows. I've never spent less than $50 on a pillow. I'm a side sleeper and like firm support, but also want something soft. I almost ordered the really pricey pillows on Amazon, but was turned off by all the odor complaints. I needed something quick to at least hold me over until I could get exactly what I want, so I took a shot with this pillow with the plan of it being a temporary fix. However, this pillow turned out to be exactly what I was looking for. The first time I laid on it I was skeptical. It had support, but felt like it may have been too soft. It took a bit to get accustomed to, but by the second night I knew this is the pillow. No chemical odors, it's quality at a low cost. I figured this pillow would've been quickly replaced and put into the leg pillow rotation, but it is shockingly a really great pillow. It is not lumpy, stays way cooler than standard or shredded memory foam and is comfy. Hopefully it holds up for a long time. I've paid triple what these 2 pillows cost for a single pillow that isn't as good.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 26, 2025
B
Verified Purchase
Bailey Lohse
Pawtucket, US
★★★★★ 5
Favorite pillows
Color: White, Size: Queen (Pack of 2)
These pillows are amazing! They are huge and plush but you can change that if you prefer. I really like that the outside cover can be washed and is also filled. It held up great in the washer and dryer. I just followed the directions on the tag. Great price for the quality and look very nice and fluffed on the bed.
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Reviewed in the United States on June 4, 2026
A
Verified Purchase
Autumn
Natrona Heights, US
★★★★★ 4
Good option
Color: White, Size: Body(Pack of 1)
I’ve been using the ACCURATEX Full Body Pillow for Adults – Hybrid Shredded Memory Foam for a few weeks now, and overall I’m really happy with it. The blend of shredded memory foam gives it a firm, supportive feel, but what I love most is that you can adjust the filling to get the exact firmness you want. Whether you prefer something more structured or slightly softer, it’s easy to customize by adding or removing foam. Comfort-wise, it’s definitely a step up from standard body pillows. It keeps its shape throughout the night and offers great support for side sleeping. That said, it is a bit firmer out of the box than I expected, which is why I’m giving it 4 stars instead of 5. If you’re looking for a body pillow that won’t go flat and lets you tweak the feel to your liking, this one is a solid choice.
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Reviewed in the United States on November 14, 2025
B
Verified Purchase
Brittany
Phoenix, US
★★★★★ 5
Favorite pillow!!
Color: White, Size: Body(Pack of 1)
I honestly wasn’t expecting to love this pillow as much as I do. Buying pillows online always feels risky because you can’t actually feel them beforehand, but this ended up being one of the best blind buys I’ve made on Amazon. The quality is genuinely shocking for the price. It feels way more expensive than it is. It’s insanely comfortable, supportive without feeling stiff, and just has that “perfect” cozy feel. I have neck problems, so I’m really picky about pillows, and this one somehow manages to be the perfect balance. It’s supportive without being stiff or overstuffed, but also not too flat where your neck feels unsupported. It has that perfect “sink in but still supportive” feel that’s hard to find. I loved the body pillow version so much that less than a week later I’m already ordering the regular pillow version too. Easily 5 stars from me!!
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Reviewed in the United States on May 19, 2026
Y
Verified Purchase
youngryand
Port Orchard, US
★★★★★ 5
Probably going to replace all the pillows in the house with these
Color: White, Size: King (Pack of 2)
These pillows are just about perfect. They have to be the best pillow for the money out there at least. I didn't even know that this kind of pillow existed but was asking Google Gemini what kind of pillow would best suit my list of needs and this is what we came up with. - High loft for comfortable side sleeping, but can be reduced by removing foam to be less high - Gives initially, but stays at that new same thickness throughout the night b/c it's memory foam chunks - Doesn't feel lumpy because it has the 1cm outer pillow layer that covers the memory foam pieces I'm 6/3" 210lbs and after a couple nights of adjusting I found that removing about 1 gallon ziploc of foam chunks from each pillow was about perfect. I saved the foam in ziplocs in case I change my mind. They come REALLY loaded at first so should fit literally anyone with some adjusting. It was definitely too big the first two nights until I got it just right.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 5, 2026

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