4 or 5 inch exhaust - Ford Powerstroke Diesel Forum
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Old 08-28-2011, 01:34 PM
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4 or 5 inch exhaust

I was wanting to know if there is much difference in a 4 inch and a 5 inch exhaust. I have a stock size strait pipe now. Love the sound but need more flow. Any input would be great. Thanks
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Old 08-28-2011, 01:55 PM
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What is your situation? do you get high egts?

Sound will increase, and you will lose some low end giong to 4" or 5"
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Old 08-28-2011, 02:26 PM
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Quote:
Originally Posted by shortyotl View Post
I was wanting to know if there is much difference in a 4 inch and a 5 inch exhaust. I have a stock size strait pipe now. Love the sound but need more flow. Any input would be great. Thanks
4" serves me just fine and the sound is mesmerizing. I couldn't really tell you wether there is a difference between 4or5" in performance. So it comes down to anything is probably better than what you got now...
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Old 08-28-2011, 02:36 PM
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4 inch unless you are pushing big power or going to soon. If not over kill.
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Old 08-28-2011, 02:39 PM
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i like 5" just because of the sound. i still might buy a 5" kit for my truck
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Old 08-28-2011, 03:18 PM
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I usually run 90 horse street on my sct but towing i run the 65 hp tow setting.
Would like to get a custom tune for towing but not sure how to go about it.
Towing in the 90 hp setting gets warm with a big load.
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Old 08-28-2011, 03:22 PM
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I am pretty sure the truck has had studs put in. I did the egr delete and new oil cooler about a year ago. Other than that nothin crazy, just a 6.0 and a six speed on 35" tires.
There might have also been some clutch work done in the past because I have never really felt any slip.
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Old 08-28-2011, 08:01 PM
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if your just in the game to use your truck for work/play then the stock size straight pipe is just fine. the only way u would NEED to get bigger exhaust is if your in the high high hp numbers and racing or pulling. 2 reasons people get the bigger exhaust is for looks and sound. the larger diameter piping the deeper the sound coming out the exhaust will be. the larger piping pay have slightly cooler egt's but if you have a totally straight piped 3"dp to 3.5" on back vs a 4" dp to 5" on back, the egts wont be very different. few degrees cooler, thats it. the main things that effect egt's with exhuast is muffler and cat.

another thing, the stock down pipe is 3", after market exhausts are either 3.5"(mbrp for example) and 4"(diamond eye for example). the larger the down pipe you get, you start to lose a tad of low end power. not a huge loss but on a stock truck you can definitely feel it with the 4" down pipe. but that is something sct tuner with custom tunes can get all that and more power back

let me know if ya have any more questions
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Old 08-29-2011, 06:28 AM
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Your not going to see any difference between a 4" or 5" besides sound, he exhaust can only flow as much as the smallest point, which in this case would be the down-pipe because the largest you can get in is a 4". The 5" will have a deeper tone, but other than that there will be no performance gain.
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Old 08-29-2011, 07:06 AM
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5" all the way!
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