4" vs 5" exhaust? - Ford Powerstroke Diesel Forum
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post #1 of 9 Old 12-17-2012, 08:16 PM Thread Starter
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4" vs 5" exhaust?

I did a quick search and can't find any threads on this topic. I'm looking at upgrading my exhaust. My truck is stock except a tuner. Is there any real advantage in going 5" over 4"? It looks like if I go 4 I can save a few bucks.

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post #2 of 9 Old 12-17-2012, 08:22 PM
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Originally Posted by Locke6169 View Post
I did a quick search and can't find any threads on this topic. I'm looking at upgrading my exhaust. My truck is stock except a tuner. Is there any real advantage in going 5" over 4"? It looks like if I go 4 I can save a few bucks.
Search again. This topic gets covered about 2-3 times a week.

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post #3 of 9 Old 12-17-2012, 08:24 PM
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Is there any advantage of 5" over 4"...... No. But bigger is always better lol. I have a 5" system on my truck, the insane whistling is not quite as bad with the 5" and it has a much deeper tone than the 4" in my opinion.


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post #4 of 9 Old 12-17-2012, 08:32 PM
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My buddy's 03 6.0 has a 5" system, I can't tell a difference between our trucks.

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post #5 of 9 Old 12-18-2012, 09:29 AM
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Save the money and go with 4in. No real gains in going to a 5in. imo

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post #6 of 9 Old 12-18-2012, 09:35 AM
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Well it depends on if you plan on doing downpipe or not. Your turbo downpipe stock is 3". Thus there are no power gains with any exhaust bigger than 3". If you do the turbo back, the biggest downpipe you can get is 4", therefore 4" exhaust is functional, 5" is just for sh!ts and giggles. Only difference is sound.

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post #7 of 9 Old 12-18-2012, 09:40 AM
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lots of post about this... only thing 5" gets you besides a bigger price tag is maybe minimal sound difference.

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post #8 of 9 Old 12-18-2012, 09:51 AM
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Quote:
Originally Posted by The Stig View Post
Well it depends on if you plan on doing downpipe or not. Your turbo downpipe stock is 3". Thus there are no power gains with any exhaust bigger than 3". If you do the turbo back, the biggest downpipe you can get is 4", therefore 4" exhaust is functional, 5" is just for sh!ts and giggles. Only difference is sound.
Some 4" turbo back systems come with a 3.5 inch down pipe. I pieced together my exhaust (trial and error of 1st diesel) and when it came time for the down pipe, all I could find separately was a 3.5".

Regardless, it sounds about the same as my buddy's 4" to 5" system.
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post #9 of 9 Old 12-18-2012, 12:14 PM
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I have a 4" down pipe to 5". Sounds great.

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