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Old 02-05-2013, 10:28 PM   #4
nukemustang
 
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Drives: 2017 Raptor, 2017 SS
Join Date: Feb 2010
Location: Charleston, SC
Posts: 277
I think it also has to do with reducing resonations when the AFM kicks in.... I used to hear the valve cycle when it would transfer back and fourth from V8 to V4 mode. Anyone who has changed out the exhaust (cat back) has removed these valves.
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