I have AC-Delco rapidfire plugs that I haven't put in yet. I was thinking of getting NGK-V plugs instead since I know a lot of people have them and they are good. So I just wanted to know if I should get the NGK-V groove plugs or are the NGK Iridium IX better? Thanks.

I think I'll go with the NGK-V. The Iridiums should last longer according to NGK but the NGK-V will do just fine, unless someone else thinks the Iridiums give more power.

Actually since NGK makes the plugs for AC Delco anyways, both are just fine!