4" or 5" exhaust? Am I gaining anything?? - Ford Powerstroke Diesel Forum
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Old 04-11-2013, 04:11 AM
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4" or 5" exhaust? Am I gaining anything??

hey guys, about get my mini maxx on order soon and im looking for a good exhaust system to slap on. I plan on going with a downpipe back system either MBRP or Flo-pro and the main question i had for everyone was, am i gaining anything at all by going with the 5" system instead of the 4"? A deeper tone, more turbo whistle? anybody had any experience with either? Just seems like everyone and their brother has 4" and I kinda just wanted to be different. your guy's advice is greatly appreciated!
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Old 04-11-2013, 05:40 AM
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It sounds like the 5" is a little deeper than the 4" to me. I went withe the 5"
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Old 04-11-2013, 05:48 AM
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I went with the Diamond Eye 5" tb set up. Very easy to install, seems to be heavy walled pipe with strong hangers. Has nice tone. Love it
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Old 04-11-2013, 06:35 AM
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was the 5" tb a tight fit on the donwpipe? ive heard there isnt much room from the turbo to the cat
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Old 04-11-2013, 06:49 AM
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5" seems to be the most popular for the 6.4. I bought a used 4" Flo Pro off CL and I'm very happy with the sound. 4" is actually negligibly better for performance up until you get to the 700+ hp range. You can't go wrong either way.
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Old 04-11-2013, 08:14 AM
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I also went with 5" on my 6.4 and was never unhappy with it.
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Old 04-11-2013, 10:04 AM
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4in DP and 5in back. Great sound, deeper tone, not quite as harsh of a sound as 4inch all the way out.

I went with all AFE and love it. Big heavy walled pipe and big heavy hangers.
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Old 04-11-2013, 12:58 PM
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To me they both sound pretty close
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Old 04-12-2013, 11:58 AM
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I have a Flo Pro 4" downpipe back. Brother has a 5" Flo Pro downpipe back. Neither of us hear much difference between the two.
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Old 04-12-2013, 02:51 PM
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Question anyone who tells you there's a noticeable difference between the two.
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