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If you remove one of your spark plugs the necessary information is printed on the ceramic insulator
 
The spark plug code is SILZKR8H9G; these are the original NGK plugs, but without the Hyundai packaging. They shouldn't give you any trouble. I'm not so sure about the ignition coils you're suggesting. They might argue that they provide more "spark" (theoretically), but the question is: is the car still under warranty?
 
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