New here. I have a 2003 C5 that I will be giving the first tune up since owning the car. Whats a good replacement spark plug for these cars?

Thanks

I like NGK TR 55s for a mostly stock C5... There's nothing wrong with the OEM plugs either, matter of fact I bet yours are probably still firing just fine!
:cheers:

:iagree: TR55's are good plugs. We use them on naturally aspirated applications all the time. And for a bone stock car, yep the factory ones keep chugging along.

NGK's are whats in mine.