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  1. 1badote

    Rpm drop

    Hello and thanks for any help, I have a 2011 mustang 5.0 and it only has 38,000 miles completely stocks expect axleback mufflers and I noticed while I’m sitting at a red light and the air is on when the Radiator fan kicks on it drops between 300 and 500 rpms then it’s smooths right back out it...
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