HKS M-Series Super Fire Racing Plugs

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Planning on getting more power out of your Hyundai or Kia by installing a RaceChip or tuning your ECU? You'll want to upgrade your spark plugs to make the most of your factory ignition system!

HKS M-Series Super Fire Racing spark plugs are high performance Iridium plugs designed to handle advanced levels of tuning and provide Improved ignition performance, durability and anti-carbon build-up M-Series Super Fire Spark Plugs


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.

Customer Reviews

Based on 12 reviews

They seem great car starts even smoother/better now. so worth it imo

HKS M45XL for 2017 Hyundai Elantra SR Turbo

These plugs are barely any more expensive than the OEM plugs, and they set you up nicely to add power to a 1.6T Hyundai motor. Arrived fast, in very nice Cherry Tuning Packaging, easy install, motor runs smooth as.

Better plugs all round for the Cerato GT.

Even though these plugs are a colder heat range than standard, they have not made the car any harder to start on cold mornings, even in wet weather ( if anything, they have made the car start a little easier, as well as run better, even during the warm-up phase ). There has been a noticeable improvement in performance, and the car seemed to have a little more torque while driving up a steep hill. After I installed the plugs, I took the car on two test drives on two different days, on my favorite 19.3 km test circuit, consisting of a mix of highway and suburban driving, with variation in ambient temperature and traffic conditions, and I was able to achieve an improvement in fuel economy over the stock plugs by about 3.2% to 4.8%, and this was with the factory tune while running 91 Octane regular unleaded. These plugs complement all the other mods that I have done to improve the car's performance ( intake and exhaust ), but I expect that I will get the full benefit from them once I install the Racechip that I bought, and run the car on 98 Octane premium unleaded. If you want to use all available bolt on mods to improve engine efficiency right across the board ( horsepower, torque, acceleration, throttle response, and fuel economy ), I would highly recommend these plugs.

Purchase Wagner Intercooling, K&N Pod filter, Racing plugs

has made a huge difference to the performance of the vehicle, and is everything i had hoped for. Will be buying more parts soon from Cherry!!

A must for modified cars...

Was experiencing periodic boost cuts on my stock spark plugs, presumably from the extra heat and load from my RaceChip S and other mods, and these spark plugs resolved the issue instantly. A must have if you are planning on modifying or tuning your Hyundai/Kia 1.6T as they are cooler and can take more load. Tristan provided a quick turnaround time and has been amazing in supplying quality parts. 10/10 recommend!!