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question about NGK spark plugs

909 Views 7 Replies 7 Participants Last post by  Roger
what's the difference between PFR6G-11 and PFR5G-11? PFR5G-11 is for normal driving condition and PFR6G-11 is for harder driving. SO what's the draw back/advantage of having a PFR6G-11 over the PFR5G-11? I have a couple of mods so should I go with PFR6G-11? look at my sig for the mods I have and let me know which plugs should i get.
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the higher the number the colder the plug

i'd check your plugs...if they show signs that they are running hot. get the colder plug. If they show normal wear, just stay with the stock heatrange.
1 - 1 of 8 Posts
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