Reviews of HKS spark plug

I’ve just bought some HKS spark plugs for the i30N.

I’m happy with HKSMR45XLZ sparks.

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).

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.

I recently purchased 6 spark plugs from Amazon for my Kia Stinger GT2. I noticed that in the last delivery, one was different.

Get the hks plugs, they work fantastic for the stinger.