From my understanding the stock plugs (Denso FXE24HR11 I believe) are heat range 7. I think most who boost or spray switch to the GTR plugs (NGK DILKAR8A8) which are heat range 8 - that's what I have in my motor now.
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2007 G37S [VQ37HR] Sedan 6MT - Fast Intentions Stage 3 TT - @ttv36 #tptoons
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