Denso Iridium Spark Plugs - 1 or 2 steps colder?

[Abilor]

Hey all,

I'm conisdering pulling the trigger on a TMIC, and DaleNixon recommends changing my spark plugs on the same job. I've found denso iridium plugs at my vendor, one at 1 step colder than stock, and the other at 2 steps colder. Which is preferred for my modded speed 3? I've got the turbosmart valve, TRZ mount package, nano SRI as other mods. Probably a turbo inlet soon too. In case any of that matters.

 

[Circle9]

I think 1 step colder would be correct for your mods. I too, am going to be putting in some Denso IVT22's (1 step colder) when I get my TMIC in. I have a CP-E SRI and testpipe.

 

[john blutarski]

one step should be perfect for your mods

 

[Abilor]

They're on the way. Will go in with my TMIC.