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The colder plugs are really not needed until you increase boost. Your 5% pulley and now Adding the headers are really canceling each other out. Any gain in boost from your 5% will be returned when you put the headers on.
Now with that said is it going to hurt your car? Absolutely not. Plugs do not need to be tuned for and you do eventually plan on increasing your boost significantly with the 28%, so mys well get it done now.
Also on another note I just added my stainless power headers with high flows to my set up and they are great, excellent craftsmanship, fitment and quality. And they sound amazing! Your going to love them.
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