4" or 5" 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 12-15-2012, 11:47 AM Thread Starter
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4" or 5" exhaust

Gathering parts for some performance upgrades. Truck currently has SCT livewire, Magnaflow exhaust w/ DPF delete, stock air cleaner. Changing to this; H&S mini-max, S&B cai, EGR delete, coolant filter, new exhaust with downpipe and CAT/DPF delete.


Question is what size downpipe and exhaust... I think 4" downpipe, but is there any advantage in performance between the 4" and 5" exhaust?


I will probably run straight pipe, and really have no future plans for more power, just reliability, so maybe headstuds & gaskets (if/when I do headstuds, will clean the intake too)

Oh yeah, looking in to the CCV deal also...
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post #2 of 5 Old 12-15-2012, 12:11 PM
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The only difference between 4" and 5" will be the sound. 5" has a deeper sound.

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post #3 of 5 Old 12-15-2012, 12:30 PM
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5". You will regret the 4" down the road like I did my 6.0. But if you don't care about looks or sound then 4" will do ya just fine

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post #4 of 5 Old 12-15-2012, 12:36 PM
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You already have a 4" on the truck. Only real gain going to a 5" will be the tone. I would just add a 4" DP and you will be good to go.

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post #5 of 5 Old 12-15-2012, 12:47 PM Thread Starter
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Quote:
Originally Posted by blackcloud2k View Post
You already have a 4" on the truck. Only real gain going to a 5" will be the tone. I would just add a 4" DP and you will be good to go.
Current DPF pipe is 3-1/2 with the large flat flange, truck still has CAT. there is a 3-1/2 to 4 increaser right at the M'Flow muffler. That is option 1, keep the muffler back and just install 4" downpipe and 4" CAT/DPF delete pipe. Back half of the M'Flow is really nice, splits into dual tailpipes with two SS tips behind right rear wheel.


I think we will go with the 4" setup, but I have access to a new full 5" system for very very very good price, so option is there.

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