4" dual vs 5" single exhaust - Ford Powerstroke Diesel Forum
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post #1 of 15 Old 09-19-2012, 06:06 PM Thread Starter
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4" dual vs 5" single exhaust

Hey I've been trying to decide on the 4" duals or 5". Does anyone have sound clips of the 4" duals? I've been trying to search it out to see if its that different from the 5" single.

Any opinions? I know most ppl have the 5" but anyone with the 4" duals have any feedback? Thanks!

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post #2 of 15 Old 09-19-2012, 08:08 PM
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There's one guy on here that I know of that has duals. Check out his YouTube vids. His Chanel name is rohde42. Here is one of his vids

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post #3 of 15 Old 09-19-2012, 09:13 PM Thread Starter
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Hmm I think I personally like the sound of the 5" better. Thanks for the link

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post #4 of 15 Old 09-20-2012, 05:22 AM
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One thing duals has over the 5", the duals help spread the sound out so it seems louder. But the 5" sounds a little deeper.

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post #5 of 15 Old 09-23-2012, 09:50 AM
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You actually get more flow from a singular larger exhaust than smaller duals. This is due to the turbulent flow as the exhaust hits the sidewalls of the pipe. You get more laminar flow from larger pipe. So in short you should get more power from the 5".

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post #6 of 15 Old 09-23-2012, 10:22 AM
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Quote:
Originally Posted by Prime Power View Post
You actually get more flow from a singular larger exhaust than smaller duals. This is due to the turbulent flow as the exhaust hits the sidewalls of the pipe. You get more laminar flow from larger pipe. So in short you should get more power from the 5".
You are splitting hairs there my friend.
If this were true, I doubt you would see any power gain unless the pipes were fed by a pair of C-18 Caterpillars.

Go with the true duals...
They look better.

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post #7 of 15 Old 09-23-2012, 10:49 AM
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Not according to Gibson. Is there a major difference I don't know. But there is one. If you don't think the flow of exhaust matters, then why change anything but the tip? Sound?

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post #8 of 15 Old 09-23-2012, 10:57 AM
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Exhaust flow does matter when there is a ton of mass moving, but the 6.7L does not generate enough exhaust mass to really make a difference between 4" or 5" pipes.
An ISX Cummins 600 will use a single 5" pipe, so I doubt a Powerstroke will see any noticeable change when a 4" is more than enough pipe.

The main reason for large pipes is to lower EGT. With todays high flowing 4 valve heads and decent factory down pipes, EGT temps aren't a real issue anymore. Now, it's more about styling.

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post #9 of 15 Old 09-23-2012, 11:03 AM
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It made a difference in my 5.3l Chevy. Have to think it would here.

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post #10 of 15 Old 09-23-2012, 11:08 AM
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Ur argument about hitting the side walls is invalid. it all floats around how much CFM the combined area/volume the dual pipes will flow vf the 5 inch.

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