Old blind guy here, I just see where it says naturally aspirated on the hyundai chart. I just didn't want to take a chance on the Autolites w the NGK 1422 plugs being so inexpensive from Rockauto. If you read any of my posts you'll see I maintain the heck out of my car. It's kinda my hobby, I enjoy doing oil & filter changes to the point I drop the oil every 2k miles and change the filter every 4k miles. I change plugs every 25k miles, brakes are taken apart and cleaned and lubed every 6 months. I do the maintenance on all three of our cars pretty much the same way. Well, except for my wife's Honda Accord, she drives less than 5k miles a year.