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Discussion Starter #1 (Edited)
My tuner is recommending that I switch to Iridium plugs? Right now I am running NGKs with a heat range of 8. Any thoughts on this?

Also, Anyone know what the NGK Iridium plug for a TFS TW head would be in the 8 heat range? Cannot seem to find any info on that....
 

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Discussion Starter #2
I got in touch with Brandon Peeler at NGK and here is what he said on Iridium part numbers for my TW heads that require a 14mm x 19mm (3/4) plug:

"If you want to stay with the same #8 heat range that you have now, then the iridium part number would be BKR8EIX stock# 2668

One heat range hotter is the BKR7EIX stock# 4644 and one range colder is the BKR9EIX stock# 2669 Hope this helps, thank you.

NGK.com - Cross Reference Search Results

NGK.com - Cross Reference Search Results

NGK.com - Cross Reference Search Results
"
 

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I run NGK stock# 4554

I might try some iridiums next.
 

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Thats the ones I meant to run, the V-powers!! I only run iridiums in regualr cars that wants longevity betweens tuneups.
 
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