4" or 5" DP back exhaust??? - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 09-26-2012, 08:11 PM Thread Starter
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4" or 5" DP back exhaust???

I'm a new guy to the diesel world. I'm looking for opinions on either a 4" or 5" DP back exhaust straight piped. I'm looking for the best sound and performance.
So far I have an s&b cai and have decided to go with spartan for tuning. The packages I have chosen from Rudy's is only about $60 difference between the 4 and 5.
Any input for this FnG would be greatly appreciated

Semper Fi,
Zack
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post #2 of 13 Old 09-26-2012, 08:23 PM
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Go 5". It will give you better sound. No performance difference. Just looks and little deeper exhaust tone.

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post #3 of 13 Old 09-26-2012, 08:45 PM Thread Starter
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Thanks, that's what I was originally thinking but it's hard to tell on you tube videos
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post #4 of 13 Old 09-27-2012, 07:51 AM
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4" is all you really need, but 5" looks and sounds better in my opinion.

Let us know if we can help with anything.


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post #5 of 13 Old 09-27-2012, 09:27 AM
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5" does sound better although it has 0% better performance. Not sure if you ever wanted to put air bags on your truck or have a in bed hitch but I just had to modify my 5" after installing my airbags. Also, I did have to bend a few hangers a little to make the 5" fit without banging or rubbing.

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post #6 of 13 Old 09-27-2012, 09:38 AM
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5" fits perfectly on my truck....and on most trucks.

I say go 5".

Jeff Dodd

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post #7 of 13 Old 09-27-2012, 09:54 AM
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Owning the same truck and also working on them I say 5" all the way, no muffler ( not needed for the stock turbo trucks ). Has a nice aggressive sound but isn't loud.


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post #8 of 13 Old 09-27-2012, 05:41 PM Thread Starter
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5" it is! I do have a b&w goose neck, but I looked and measured today and looks like everything shoud fit great. Can't wait to get this on my truck. Thanks for all the info
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post #9 of 13 Old 09-27-2012, 07:51 PM
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I have air bags and a 5th wheel hitch installed, run 5" with no clearence issues anywhere.

Just purchased a new 2016 CC
SOLD
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post #10 of 13 Old 09-28-2012, 07:35 AM Thread Starter
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Thanks guys for all the info! I just placed my order for the spartan tuner and 5" cat/ dpf delete straight pipe! Should be here sometime next week, can't fricken wait!!
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