hey guys, as you know i sold almost all of my stuff off my car recentley but i still have my ngk spark plugs that are 1 step colder in right now. i dont know if decreaseing power now or not but i would like to go back to a normal heat range plug and im wondering whats best. that would be great, thanks!

 

^OEM

 

 

heat range 7 in and NGK plug is all you need for a stock or mildly modded s2k.

 

As long as the plugs aren't fouling out, then colder plugs are better. I'd just leave them alone.