Spark plug Question

I have an S5 engine all stock w/Microtech LT-8.
I have stock cleaned 550 primary inj. and new 750 secondary inj.
I plan to run about 10-12 psi. of boost.

What would be a good spark plug for this set up?

 

NGK NGK NGK NGK...i am using the cheap ones...6 bucks each but you could get the ones that will last longer that are like 34 bucks each....


NGK

 

NGK BUR7EQP leading & BUR9EQP trailing - (platinum for that longer lasting experience.)

My last set from Advance Auto Parts were $4.98 each.

 

Ok, maybe I should have been clearer. I’m looking for a temperature range.
Should I just use the stock temp. plugs or should I go colder by 1 step or maybe 2 steps colder? I have also read that copper plugs are better for forced induction applications over platinum plugs. I don’t really care about longevity.

 

In the South (like Houstan) I would probably run all 9s in the trailing and leading positions with under 15psi.

 

Thanks, thats what I was looking for.