[RecycleBins]

1. I have a 2013 Kia Optima SxL, which spark plugs would be better? I live in the Midwest so winter is very harsh, I'm not sure if that plays into anything. I was looking online and saw NGK 1422 and HKS M45XL. Which one would be better, or is there something else I should get instead. I do not have a tune and do not plan on getting one.

 

[DINO2K]

Stick with NGK1422 as you have no intentions of using a tune and you’ll be fine, HKS plugs are intended for using a tune if I’m not mistaken.


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[RecycleBins]

Stick with NGK1422 as you have no intentions of using a tune and you’ll be fine, HKS plugs are intended for using a tune if I’m not mistaken.


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Ok thanks! Also what tunes are there and what do they do? Is there any benefit or more so cons?

 

[DINO2K]

Ok thanks! Also what tunes are there and what do they do? Is there any benefit or more so cons?

You can check out Lap 3 uncle chip that K5OS sells which will increase your HP depending which option you pick, everyone goes for the 91/93 octane fuel which increases about 50 hp.


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[DINO2K]

LAP3 Uncle Chip Performance Tune

FREE SHIPPING WITHIN THE US! Description: Brand new performance tune for Kia & Hyundai Models Quick & easy 5-minute Plug & Play installation setup Does not compromise drivability of the vehicle Increased throttle response after installation Retains all OEM safeguards from factory Tune is...

www.k5optimastore.com

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[williamhood]

FWIW: I used to run the HKS M45XL plugs with my mods and ECU tune but with my setup it will eventually carbon fouls the plugs around 5-6K miles due to them NOT getting hot enough to burn off the crap. I purchased one heat range hotter from David at K5Optimastore, the HKS M40XL plugs (still gapped at 0.028") and these have been great. Highly recommended.
Carbon fouling will result in harder starts, rough idle and other issues eventually.

 

[K5 Optima Store]

I would recommend the NGK1422 plugs as well if you don't plan to tune the vehicle in the future.

NGK 1422 (ILKR8E6) Spark Plugs - K5 Optima Store (Equivalent to the stock OE plugs)

HKS M45XL Spark Plugs - K5 Optima Store (Upgraded Racing Style plugs)

Everything on our entire website is on sale until the end of the year, so now is definitely the best time to order & save.