Best plugs

[pontiacGTP123]

I'm sure this has been covered many times but I can't really remember. I used to run auto lite 104s in my old gtp but it was mildly modded. What's the best plug for a stock gtp. I got a set of cheap Bosch plugs but I'll probly take then back and get something better of needed

 

[dsmuts]

Don't use Bosch. Use autolite 606 iridium

 

[00grandprixgtp]

I like ngk not sure with anyone else car but I ran the 104 runs great when it cold but when It is hot outside it feels sluggish but with the tr6 it seems to run good year round use to like autolite but seems like quality has really went down

 

[dsmuts]

When stock there is no need to go colder than stock

 

[REDCRAPGP]

Autolite 606

 

[CyxRyan]

When I re did my plugs/wires I went with ACDelco Iridium Spark Plugs & ACDelco Wires.

 

[pontiacGTP123]

I went ahead and got the autolite xp606 iridiums. So far so good. The plugs was originals. The car has 170k. The tips of the plugs was burnt off. The wires was cracked all over. I'm surprised it even ran.