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I was looking into getting some one step colder spark plugs but don't know the advantages of either the Denso Iridium or NGK. Can someone guide me here?
 

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Have used both. I prefer the NGK Iridium Plugs - LFR6A1X-11.
 

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Back in the days when I had nitrous, I used the NGK 1 step colder plugs.

When I went FI, I used NGK 1 step colder plugs and never had any issues.
 
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