I have a d-series turboed, running 15psi, with stock plugs set between .30-.35. I was thinking about going a heat rating to a 6 or 5, but not sure. What do you have? And how does it run?

 

use the forced induction section. they are really good at helping out

 

get some NGK plugs about 2 steps colder than stock. i cant remember the part number off the top of my head right now. i had them, and gapped them to about .28. hope that helps.

 

Thanks I was thinking about heat rate of 5 but I have delt with supras, and they has some problems with some plugs at that low, but I do know that cheap plugs are good plugs, you dont have to by $25 plugs to run it good.