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  1. #5 Re: NGK spark plugs for stock 
    Swash
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    Default 07-14-2009
    Quote Originally Posted by bluegtp91 View Post
    I thought that the TR55's were still one step colder. At least that is what all the other sites say...IIRC...

    I could be wrong...but I'm not. NGK is weird on this one - the TR6 is actually their one-step colder plug...where the heat range on the stock plug is actually....6. So it would make sense - and follow the same convention as most of the other manufactures to have the TR5xxxx be the one step, TR4xxx be the 2 step, etc etc etc.


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    Last edited by Swash; 07-14-2009 at 03:28 PM.
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