This may just be my experience, but I have never once appreciated any operational improvement replacing wires. I know, everyone claims they go bad, and need to be replaced periodically. Others will claim performance improvements with fancy wires or whatever. I have bought fancy wires too, and never noticed any change.

Perhaps I'm just lucky to have not had an actual ignition wire failure...

Good luck.

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1986 300E 5-Speed 240k mi.