4" or 5" DP back exhaust??? - Ford Powerstroke Diesel Forum
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Old 09-26-2012, 07:11 PM
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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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Old 09-26-2012, 07:23 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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Old 09-26-2012, 07:45 PM
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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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Old 09-27-2012, 06:51 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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Old 09-27-2012, 08:27 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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Old 09-27-2012, 08:38 AM
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5" fits perfectly on my truck....and on most trucks.

I say go 5".
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Old 09-27-2012, 08:54 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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Old 09-27-2012, 04:41 PM
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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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Old 09-27-2012, 06:51 PM
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I have air bags and a 5th wheel hitch installed, run 5" with no clearence issues anywhere.
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Old 09-28-2012, 06:35 AM
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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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