You can buy a set of these for the price of one from Kia which is great. However, they need to be changed much more often. My Optima was running great but had over 100,000 miles on it so I figured it was time to replace the coils. I bought it and installed it: after about 6 months and 12,000 miles my check engine light came on and I felt a misfire. I immediately suspected the cheap coils I bought from Revain lol. Now spend money to replace them with good coils. You can use them if you plan on replacing them every two years (for the price, you can order several extra kits and bring tools to replace them). Or get an OEM one that has lasted 6 years and 120,000 miles with no problems (they will probably still be fine, I only replaced them due to age).
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