HKS M-Series Super Fire Racing spark plugs are sold individually. These high performance iridium plugs are designed to handle higher boost with improved ignition performance and anti-carbon build-up. Fits 90’s Integra, Civic, CRX, Prelude, 180SX, 300ZX, R32, R33, R34 Skyline, MR2, 7MGTE Supra… Please double confirm fitment with your vehicle before purchase!
Known Vehicle Fitments:
1991-1993 Acura Integra B18A1/DB1
1992-1996 Honda Civic D15B7/EY4
1987-1991 Honda Civic D15B2/EF2/EF4
1987-1991 Honda CRX D15B2/EF6
1985-1991 Honda Prelude B20A5/BA1/BA4/BA5
1989-1991 Nissan 180SX CA18DET/RS13/KRS13
1984-1989 Nissan 300ZX VG30T/HZ31/HGZ31
1989-2002 Nissan Skyline RB26DETT/BNR32/BNR33/BNR34
1991-1993 Nissan Skyline RB25DE/ECR32/ER32
1989-1991 Nissan Skyline RB20DE/HR32/HCR32/HNR32
1989-1991 Nissan Skyline RB20DET/HCR32/HNR32
1988-1989 Toyota Celica 3S-GTE/ST165
1987-1989 Toyota Celica 3S-GELC/ST162
1984-1989 Toyota MR2 4A-GELC/AW11
1987-1992 Toyota Supra 7M-GTE/MA70
Includes:
(1) Spark Plug
Spark plugs are sold individually price is for one plug!
Heat Range and Thread
| Part Number: | Heat Range: | Thread: |
| 50003-M45 | NGK #9 | 14mm x 19mm |
HKS Plug Heat Range Conversion Chart
| HKS | 25 | 30 | 35 | 40 | 45 | 50 | 52.5 | 55 |
| DENSO | 16 | 20 | 22 | 24 | 27 | 31 | 32 | 34 |
| NGK | 5 | 6 | 7 | 8 | 9 | 10 | 10.5 | 11 |
0.6mm Iridium Alloy Center Electrode:
Iridium Alloy Center Electrode reduces voltage requirement as well as improving ignition performance and durability.
Outer Electrode with Platinum Chip:
The Outer Electrode incorporates a square platinum chip which improves durability, and when combined with the iridium center electrode boosts ignition performance.
Short Type Outer Electrode (Anti-Vibration):
The outer electrode has been shortened and engineered with the ideal shape to decrease weight for resistance against vibration. This anti-vibration design improves longevity of the outer electrode.
Thermal Edge:
After long idling or various combustion conditions carbon buildup can occur causing misfires. The Thermal Edge of the ceramic insulator will discharge to help decrease carbon deposits.
Spark Support Gap:
Discharges will occur in the Spark Support Gap (space between the tip of insulator and the base of the outer electrode) to help prevent carbon buildup.
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°C, opposed to the 1769°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
Fast Shipping with Professional Packaging
We provide a variety of shipping options thanks to our long-standing relationships with UPS, FedEx and DHL. Our warehouse personnel are well trained and will be able to pack your goods in accordance with the exact and precise specifications. Before shipping, all goods are carefully examined and secured. We deliver to thousands of clients each day across multiple countries. The fact that we're dedicated to becoming the largest online retailer in the world is obvious. Warehouses and distribution centers can be found in Europe as well as the USA.
Orders that contain more than one item are assigned processing times according to each item.
We will inspect each and every one of the items ordered before shipping. The majority of orders are shipped within 48-hours. Delivery is expected to take between 3 and seven days.
Returns
We do not manage the stock in our warehouse or factory. The levels of stock can change at any time. Please be aware that it's possible for your order to be out of stock after you have placed the order.
The policy is 30 days. If it's been longer than 30 days since you bought the item We're sorry to say that we can't offer you a full refund or exchange.
The item cannot be used, and it must be in its original condition. It must also still be in the original package.
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