Copper plugs will always give the best spark as it is a better conductor than platnium or iridium. The down side is short life. Platnium and iridium plugs will give good performance with a long life. With the G2 ignition system being as good as it is, you don't really need copper plugs until your doing some serious shots of NOX or forced induction.
question about NGK spark plugs
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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