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Looking for the best spark plug.........

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Old Oct 2, 2014, 03:05 PM
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Looking for the best spark plug.........
Gonna change my plugs soon and wanna know what the best plug to put in our cars are?
I see the say NGK laser iridium and I know one heat range colder is good but is there something better for it?
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Old Oct 2, 2014, 07:36 PM
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I use the Evo X's plugs which are one step colder and work fine. Not sure what everyone else uses but NGK works pretty good from my experience.
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Old Oct 3, 2014, 06:50 AM
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I also use the Evo X plugs. They work fine.
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Old Oct 3, 2014, 08:30 AM
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If you are stock boost - stay to the heat range specified. Once boost is increased - use the EVO X heat range.
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Old Oct 3, 2014, 08:56 AM
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Stock OEM NGK plugs is what should be used. I tried 2 other plugs just to see if there was a difference and had a bunch of firing issues and it changed my fuel trims when logs were taken. Put OEM plugs back in and works flawless.
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Old Oct 4, 2014, 02:42 PM
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Yes Im running a bit higher boost so OEM Evo plugs it is!
Thanx guys and gals!
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Old Oct 5, 2014, 02:57 PM
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perscisely what heat range is the oem RA plug and the evo x plug?
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Old Oct 7, 2014, 11:11 AM
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Originally Posted by robyn402
perscisely what heat range is the oem RA plug and the evo x plug?
The heat range is 7 for the ralliart and 8 for the evo x.

(NGK ILKR8E6) - evo part no.
(NGK ILKR7E6) - ralliart part no.
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