NGK BKR6EIX

[whiplash willy]

I recently bought NGK BKR6EIX (Iridium IX) plugs for my s13 Blacktop SR20det. I was told they come with the proper gap. I want to make sure, can someone tell me the proper gap for these, and is the gap the same for copper, platinum, and iridium? I can tell there is a visual difference in the gap between these and my stock pfr6b-9 platinum plugs. Also, do you use inches or mm to measure gap.

[TKOcrewSR]

i'm not sure if the gap is the sme on copper or irridium plugs but the gap for irridium is .028 which most ppl usually set them to but always double check the gap when you buy a new set of spark plugs. also what mods do you have done to your car to determine your heat range of your plugs.