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Registered
Join Date: Apr 2002
Location: Houston (Clearlake), TX
Posts: 11,361
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The P is projected, not sure about the C. The NGK site or brochure is usually helpful.
The bigger question is what are you running a 9 heat range in? That's usually motorcycle territory.
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2014 Cayman S (track rat w/GT4 suspension)
1979 930 (475 rwhp at 0.95 bar)
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