Ford Mustang ForumThis forum is for the discussion of all Ford Mustang models, including the Ford Mustang, Ford Mustang Convertible and Ford Mustang Coupe and all older/classic models and submodels.
Has anyone put the underdrive kit on the V6/V8? What are the
pros/cons. Was there a noticable power gain? How about iridium
spark plugs. Any users? Any difference?
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