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I'd like to change my spark plugs so I was doing a little snooping around. It seems lots of guys use NGK TR5's, or 5IX's for Irridiums....... I found this interesting info at NGK Canada which seems to say we should be using the colder TR7 (IX) with even minor mods.......
Check it out
http://www.ngksparkplugs.ca/products-spark-plugs.cfm
Check it out
http://www.ngksparkplugs.ca/products-spark-plugs.cfm