I’ve just bought some HKS spark plugs for the i30N.
Pros: bought for future power
Vehicle:
Hyundai
Reviews of HKS spark plug
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19 votes
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I’m happy with HKSMR45XLZ sparks.
Pros: happy with performance
Part number: MR45XLZ
Also, make sure you go with the HKS plugs, they will be the longest lasting plugs, followed by NGK (yes, I know that HKS is owned by NGK).
Pros: longest lasting plugs
I used that set of plugs with gaps 0.028 and remained stock for few months. I kept running hk plugs on day to day and it was really not good for stock tune daily use. Car felt sluggish at regular driving. I realized those were 2 step colder plugs and requires a tune or else you won't generate enough boost on daily driving.
Cons: not good for stock tune, sluggish driving
Vehicle:
Kia
I recently purchased 6 spark plugs from Amazon for my Kia Stinger GT2. I noticed that in the last delivery, one was different.
Vehicle:
Kia
Get the hks plugs, they work fantastic for the stinger.
Pros: work fantastic
Vehicle:
Kia
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What we know about HKS spark plug
The brand is registered in Japan.
In March 2026, PartReview does not yet have a formed opinion of HKS spark plug. This part is not in the ranking due to insufficient reviews. You can help by adding a review for HKS spark plug.
Currently there are 6 reviews and 19 votes. Average rating — 4 out of 5. Vote balance: 14 up, 5 down.
Users also evaluated the qualities of HKS spark plug:
- Starting - cold starts are difficult - rated positively. 5 points out of 5.
- Idle - engine shakes and runs unevenly at idle - no rating yet
- Acceleration - hesitation or stumbling when speeding up - rated ambivalently. 3 points out of 5.
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