i changed mine like 2 months ago and used some cheap ngk plugs. the car feels the same as it did with the old ac delcos. looked like the original too. its a 93 z8 93kmiles. so anyway a friend that told me about the airdam being the problem with the overheating i had said to stick with the ac delco platinum plugs. he used to have a 97z28 and is a mechanic so idk. do yall think its worth changing them? what kind do yall perfer?

 

yes you need to chaged to the ac delco spark plug.