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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
I dont see how it could effect performance, maybe electrical. I have a hi/low switch in console to operate mine. If i had it running constantly it would never get above 130 degree's.