- Jul 26, 2007
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I was think about upgrading the coil on plugs on my 07 GT (normal asperated). Granatelli makes a couple of versions for the 4.6. A 40,000 volt coil for increased fuel milage and a 60,000 volt coil with up to a 12 hp gain. Is it worth the extra 50 pounds of cash to get the 60,000 volt coil or would it be worth spending that kind of cash on an engine that will only have bolt on upgrades
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