Exhaust diameter -Mpg - Ford Powerstroke Diesel Forum
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  #1  
Old 01-04-2011, 10:43 AM
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Exhaust diameter -Mpg

My delete pipes are stock diameter and I am still running stock tailpipe. Would a larger pipe help mpg, I wouldn't think it would do much other than lower egts but Im reaching for some better mileage.
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Old 01-04-2011, 10:49 AM
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Doing a 4" downpipe into a 4" downpipe back exhaust with no muffler might help some, but I wouldn't think it would be anything major.
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Old 01-04-2011, 10:55 AM
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How big a pain is removing and installing the downpipe? I cut my 6.0's off to make it easier, don't want to do that on my 6.4. Thanks
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Old 01-04-2011, 10:58 AM
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There is a way to do it without cutting it, but I think it involves moving the transmission over some.....or you can pull the cab to replace it lol

I just cut mine. If you get a ball and socked style downpipe, it will bolt up to your DPF if you needed to go to the dealer for anything.
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Old 01-07-2011, 10:51 AM
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what diameter is the stock tailpipe (DPF to tip)?

Thanks
Eric
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Old 01-07-2011, 12:55 PM
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The stock exhaust is 3.5"
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