exhaust size?? - Ford Powerstroke Diesel Forum
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Old 05-01-2011, 07:49 PM
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exhaust size??

hey guys im buying exhaust this week and want to know what size i should go with 4'' or 5'' and the down pipe is it better to have a 3.5 or 4'' ive heard alot of different things but nothing the same,some help please
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Old 05-02-2011, 03:57 AM
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What are your plans as far as power goes?

Staying under 500HP, just a tuner, go with the 4" system.
Plans on going big, or like a loud exhaust, go with the 5" system.

As for DP, I'm trying to find a 4" that mates to the CAT but not having any luck. There is not much of a change between the 3.5" and the 4" DP for EGT's.
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Old 05-02-2011, 05:26 AM
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A 4" is fine and sounds great straight piped. A 5" will give you a little lower tone. that is the only difference. A 4" down pipe takes some trial and error fitting to get it so it isn't rattling on something like the up pipe, firewall, etc. on the 05-07. A 4" down pipe takes some BFH fitting on an 03-04 to get it in.

Here is the difference between the oem down pipe and a 4".

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Old 05-02-2011, 07:23 AM
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Is the stock downpipe 3-inch?
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