TwinTurbo.NET: Nissan 300ZX forum - Cut & Paste from Specialty Z website:
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Subject Cut & Paste from Specialty Z website:
     
Posted by not4resaleZ on April 19, 2010 at 12:30 PM
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In Reply To Spark plug questions posted by boosted4life on April 18, 2010 at 07:29 PM
     
Message NGK Iridium IX Spark Plugs.....The "7" heat range is an excellent all around plug. Work great for direct stock replacement applications and modified vehicles. Great for anything under 20 psi. Works great on non-turbos. Great in cold weather applications.

     
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