muff or no muff - Ford Powerstroke Diesel Forum
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Old 03-26-2010, 07:58 AM
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muff or no muff

i was wanting to know what gives you better mpg when it comes to exhaust. i currently have 4" straight pipes but talking to some freinds they said there mpg went down when they took off there muffler. is that a coincidense or is there some truth to it
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Old 03-26-2010, 10:49 AM
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They probably got a heavier foot because they liked the sound.
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Old 03-26-2010, 11:37 AM
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less restriction=better breathing truck=theoretically better mpg.
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Old 03-26-2010, 11:39 AM
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It dont matter....
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Old 03-27-2010, 07:56 AM
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ON a diesel it won't matter, might help, on a gas it could hurt mpg's.
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Old 03-27-2010, 01:40 PM
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no muff=nice sounds..
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