4inch vs 5inch exhaust - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

 
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post #1 of 5 Old 09-30-2012, 07:12 PM Thread Starter
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4inch vs 5inch exhaust

So doing a turbo back straight pipe and wanted to know the difference between a 4 and 5 inch pipe. Opinions?
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post #2 of 5 Old 09-30-2012, 07:46 PM
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I just ordered my 5 " from PTP. I do not have first hand experience. But from reading posts. There is no major difference between a 4" over a 5" other than a deeper sound. I hope that helps. Other wise, give Nate or Eric a call at PTP, found they have great pricing as well.

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post #3 of 5 Old 09-30-2012, 09:24 PM
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The 5in will provide a slightly deeper sound then the 4in, but a 4in will actually out perform the 5in until your pushing huge HP numbers.

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post #4 of 5 Old 10-01-2012, 05:40 AM
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Originally Posted by smotrs View Post
The 5in will provide a slightly deeper sound then the 4in, but a 4in will actually out perform the 5in until your pushing huge HP numbers.

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Installed a 5 inch FloPro in conjunction with the Minimaxx and S&B air intake about 2 weeks ago. The exhaust was simple to install and fit very well. I was hung up on the 5 vs 4 also, but knew I would regret doing a 4 inch knowing something bigger was out there for a few pennies more. I checked everything in my driveway yesterday and the clamps held fine (as expected) and the truck runs great. It does sound like a jet with light acceleration going through congested towns...but does get attention. When you step up the tune and punch it, it comes alive....my two cents....
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post #5 of 5 Old 10-01-2012, 07:37 AM
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4" and 5" will perform the same, the only differences are going to be the sound and look. The 6.4L is a bit on the quiet side even when straight piped so most people go with 5" because they like the deeper tone.



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