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Come on guys lets stayt away from "snake oil " theres no way that a plug change will do anything UNLESS your old plugs were dirty or the wrong plug for the application. I remember when i was a fleet mechanic my boss had me install some brand xx plugs in is truck and he liked them so well he ordered like a hundred sets or so for the fleet .
Problem was i didnt install them i his truck thye were still on my desk !!!!!!!
Oh well i wore the racing jacket he got and used the wall cabinent in the shop .......
I could write a spark plug story every week if you want to hear them ????