¥15,600Original price was: ¥15,600.¥14,000Current price is: ¥14,000.
Product code: See the product code table.
Price for a set of 4 plugs. Please specify the product code when placing the order.
Please select per-product shipping when placing the order. This can be shipped via economy air shipping to most parts of Asia, the US, and Europe. However, the territories cannot be covered with this shipping, we may request an additional shipping charge after the buyer places the order.
Ignitionability, durability, and anti-insulation are all reinforced. HKS has made the best plug for both tuning engines and stock engines.
Features
0.6mm Iridium Alloy Center Electrode
Iridium alloy center electrode reduces voltage requirement and improves ignition performance and durability.
Outer Electrode with Platinum Chip
The outer electrode incorporates a square platinum chip which improves durability, and combining with the iridium center electrode boosts ignition performance.
The outer electrode features a shortened tip design and tapered shape while maintaining the necessary space for proper ignition.
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 the longevity of the outer electrode.
Thermal Edge
After long idling or under various combustion conditions, carbon buildup can occur causing misfires. The thermal edge of the ceramic insulator discharges to help decrease carbon deposits.
Spark Support Gap
Discharge occurs in the spark support gap (space between the tip of the insulator and the base of the outer electrode) to help prevent carbon buildup.
Performance and Efficiency
Increased Ignition Performance
Decreased voltage requirement strengthens ignition performance under harsh conditions like lean mixture or high boost pressure.
Improved Durability
New material and design improve durability which allows for use under hard combustion conditions like continuous high load during circuit driving or aggressive tuning.
* Improper combustion condition and wrong heat range selection may cause damage to the spark plug.
Decreased Carbon Deposits
Thermal edge and spark support gap help prevent carbon buildup for better ignition under various combustion conditions.
Special Design RE-type for Rotary Engines
 Rotary engines reciprocating design have a different mechanism and combustion condition. RE-type spark plugs are specially designed to meet the different requirements for rotary engines. The straight shape platinum outer electrode enables reliable ignition performance.
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
* Above information is the reference for heat resistance.
HKS SUPER FIRE RACING (M SERIES)
Spark Plug Type
Thread Size
Wrench Size
Heat Range
Product
Code No.
JIS Type
φ14×19mm
16mm
NGK #7
SUPER FIRE RACING M35
50003-M35
JIS Type
φ14×19mm
16mm
NGK #8
SUPER FIRE RACING M40
50003-M40
JIS Type
φ14×19mm
16mm
NGK #9
SUPER FIRE RACING M45
50003-M45
ISO Type
φ14×19mm
16mm
NGK #7
SUPER FIRE RACING M35i
50003-M35i
ISO Type
φ14×19mm
16mm
NGK #8
SUPER FIRE RACING M40i
50003-M40i
ISO Type
φ14×19mm
16mm
NGK #9
SUPER FIRE RACING M45i
50003-M45i
G Type
φ14×19mm
20.8mm
NGK #7
SUPER FIRE RACING M35G
50003-M35G
G Type
φ14×19mm
20.8mm
NGK #8
SUPER FIRE RACING M40G
50003-M40G
G Type
φ14×19mm
20.8mm
NGK #9
SUPER FIRE RACING M45G
50003-M45G
X Type
φ12×19mm
16mm
NGK #8
SUPER FIRE RACING M40X
50003-M40X
XL Type
φ12×26.5mm
16mm
NGK #8
SUPER FIRE RACING M40XL
50003-M40XL
XL Type
φ12×26.5mm
16mm
NGK #9
SUPER FIRE RACING M45XL
50003-M45XL
LONG REACH Type
φ14×26.5mm
16mm
NGK #7
SUPER FIRE RACING M35iL
50003-M35iL
LONG REACH Type
φ14×26.5mm
16mm
NGK #8
SUPER FIRE RACING M40iL
50003-M40iL
LONG REACH Type
φ14×26.5mm
16mm
NGK #9
SUPER FIRE RACING M45iL
50003-M45iL
HL Type
φ12×26.5mm
14mm
NGK #8
SUPER FIRE RACING M40HL
50003-M40HL
HL Type
φ12×26.5mm
14mm
NGK #9
SUPER FIRE RACING M45HL
50003-M45HL
HL Type
φ12×26.5mm
14mm
NGK #10
SUPER FIRE RACING M50HL
50003-M50HL
CONICAL SEAT LONG REACH Type
φ14×25mm
16mm
NGK #7
SUPER FIRE RACING M35LF
50003-M35LF
CONICAL SEAT LONG REACH Type
φ14×25mm
16mm
NGK #8
SUPER FIRE RACING M40LF
50003-M40LF
RE Type
φ14×21.5mm
20.8mm
NGK #9
SUPER FIRE RACING M45RE
50003-M45RE
RE Type
φ14×21.5mm
20.8mm
NGK #10
SUPER FIRE RACING M50RE
50003-M50RE
RE Type
φ14×21.5mm
20.8mm
NGK #10.5
SUPER FIRE RACING M525RE
50003-M525RE
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