iridium sparkplug question

The G-Series Tuning Forum is the place to discuss G35/G37 performance modifications and mechanical repair.
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USMCgetsome
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Car: OWN S13.5 RB25DET/2003 G35
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So even though were mostly na why do people suggest we go one heat range cooler?

i want to replace mine this week but am having a hard time deciding which one to go with the 5 or 6

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cmesurf
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Joined: Sat Oct 10, 2009 4:07 pm
Car: Infinitis, 03 FX35, 07 g35 sedan, 05 FX45, 09 G-vert & 14 Q50S Hybrid AWD

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Read this"6 NGK LFR6AIX-11 Iridium IX Sparkplugs (these are 1 heat range cooler than stock)

http://www.nicoclub.com/articles.php?id=299579
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