[AZ_David_Machowski]

So my STi was tuned back in December, making 311awhp and 334tq on 91.

Mods are
Cobb SF Intake
Nvidia catted down-pipe
Perrin cat back exhause
Cobb Access port pro tuned to 91
Perrin FPR (to fix stumble)


So my question is, I live in AZ and heat soak is pretty bad (next buy is FMIC), question is would I benefit due to heat here going to the one step colder plug NGK 2309?

Thanks,

Dave