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does 2004 Mustang cobra need retune for smaller pulley

2617 Views 7 Replies 6 Participants Last post by  ericmuscle
looking at buying an 2004 cobra with smaller supercharger pulley but owner says engine computer hasnt had a new tune for smaller pulley does it need one? thanks
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Yes, it will require a retune. Computer has to add more fuel for the added air flow.
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