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Awesome info ! Here, I have been reading up on heat ranges and what not. Definitely going with Ngk iridiums. Thought about going with a heat range of 8 for my 460-530 hp rb25. I have the general hp range due to my over all tune. Do you guys think 8 is a suitable heat range. It's still pretty new fresh material I am learning.
I have always just went with copper. Never had any probs, cheap, replace 1x a month with my monthly oil change on my previous cars. Iridium comes around and now takes the stage when it comes to spark plugs.
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