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Will adding dual exhaust and spark plug change increase gas milage on a sport trac?
Wiki User
∙ 10y ago
If it needs new spark plugs then that will help gas mileage but if the plugs are firing ok and gapped correctly then new plugs will not help. Adding true dual exhausts will add a little power and may help mileage slightly but you will prpbably never ever recoup the cost of the dual exhaust system in fuel savings.
Wiki User
∙ 10y ago
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