If I get a future setup of the following:

VF23 or 39
STI pinks
Fuelpump
up/downpipes
A Tune

My question im replacing the sparkplugs soon but will stock oem plugs be ok or would a onestep colder fit my mods?

I hear plugs can hold powe back a little when tuning?

Gee....thanks for clogging up our forum with a question that has been asked and debated since before you were born. Did you ever think to post in the right forum? Did you ever think to read the FAQ and sticky threads at the top of the forum that this type of question most likely belongs in? Use your head Fred.....your posts are a discourteous to others.