I have a 2006 cobalt ss/sc by the time I buy the plugs I will have devils progressive meth kit pacesetter header catless dp 60lb injectors 2.79in pulley front mount h/e and a flowmaster muffler. My question is do u think I need 1 step colder plugs or 2step colder plugs rite now I have stock plugs

 

1 Step colder copper plugs are what you need. Ngk and autolite make them

 

U don't think I need 2 step colder plugs I'm pumpin 18-19 boost rite now

 

No not at all, our cars like copper plugs much better. I ran 25 psi 300+ whp on step 1's

 

Step 1 it is then

 

do you happen to know the part number in the copper plugs you used Lsj?

 

auto lites r
3922 i think

 

i had a question. how come when i emailed ngk direct they told me 2 step colder. should i get that or stick w/ 1 step?

 

Trust me, you want copper step one colder. part number is 4644

 

thanks man I'm plan on starting my car up tomorrow from the rebuild was that the part number for autolite?

never mind they are for ngk's

 

I always heard that meth would eat up the copper.

 

what about for my car??