What brand are stock plugs?

[Banismo]

I have to change plugs on a 2002 grand prix GTP(supercharged). I haven't pulled a plug to check(not my car) and have done a search, still unsure as to stock plugs. Just want to get it back to off the show room floor. What company/brand are stock? GM does not make spark plugs, so they use some company and I will not pay dealership prices. I know there are copper/plat/iridium. I would most likely go with iridium of the stock brand.
Thanks
Don

[DEI37]

The AC Delco plugs are rebadged NGK's if I remember right.

[Jack44]

Stock plugs for the 2002...Well the Regalgs'...Are AC Delco ITR4A 15...Iridiums...

A good substitute if you are not doing a lot of Modifications, and don't want to change every 10,000 miles by going to Autolite Coppers... Is the AC Delco 41-932...

[Banismo]

well I've read TR4A 15 is the NGK number for the lazer cut iridium and TR55IX for iridium IX. Well ngk I guess makes ac delco plugs at least that is the word on the street. Most do not have the plat delco, just iridium AC delco(41-101 part store number) at napa and autozone. I found the stocker plats at summitracing for a heads up.
I used autolites on a chevy 3.1 once, it shook bad. Seems here modded run the autolites so they must work.
Thanks
Don
Good stuff for me, I drive a maxima

[01gtprocket]

my 01 came with NGK..

But my gm replacment motor cambe with acedlco plugs.. I thnk.. getting old lol