4" or 5" Exhaust - Ford Powerstroke Diesel Forum
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Old 04-28-2010, 06:08 AM
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4" or 5" Exhaust

My buddy just traded in his 7.3 PSD for a 07 and he wants to do an exhaust on it, he likes the duals that I have but according to him, to many people have them and he wants to change it up and do a 5" system but is worried that it'll kill his engine. He wants to add a SCT, a nice turbo, some 190cc injectors, to make around 550hp once all is said and done. What would you recommend 4" duals or a 5" single?
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Old 04-28-2010, 06:12 AM
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4" is all you need
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Old 04-28-2010, 06:13 AM
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4" will work just fine 5" is just overkill. If you want some prices, let me know, I would be happy to get you some.
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Old 04-28-2010, 06:28 AM
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Quote:
Originally Posted by Abrannan19 View Post
4" will work just fine 5" is just overkill. If you want some prices, let me know, I would be happy to get you some.

That'd be cool if you could shoot me some prices for the MBRP 4" aluminum duals and for the 5" installer series


If he did use a 5" would he basically be killiing his truck until he added the inejctors and turbo? I know back when I had my 97 cummins, when I did my stack I changed from 4" to 5" and it really didn't feel like I lost anything but that truck was pushing alot more fuel than what my friend is trying to get out of his 6.0
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Old 04-28-2010, 06:31 AM
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You don't need backpressure on a diesel! Everybody keeps thinking they will lose power with a bigger exhaust. You won't! You gain power with a bigger exhaust. These are not the same as gas motors, guys.
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Old 04-28-2010, 07:52 AM
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Originally Posted by dieselmast View Post
You don't need backpressure on a diesel! Everybody keeps thinking they will lose power with a bigger exhaust. You won't! You gain power with a bigger exhaust. These are not the same as gas motors, guys.
Yeah, turbos don't like to see back pressure. You'll only gain a little deeper tone with the 5" though. 4" is plenty big enough.
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Old 04-28-2010, 07:59 AM
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Heck, just last week I went to the muffler shop and the guys there cut out the muffler and the cat so now Im runnin a straight pipe with the 3 1/2" stock pipe. It sounds GREAT, runns really well and I kept the 3 1/2 cus the guy said that no matter what size you put behind the engine, your down pipe is still 3". He didnt recommend the larger pipes unless you got a larger down pipe. What do y'all think??
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Old 04-28-2010, 08:16 AM
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4" will be good
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Old 04-28-2010, 01:57 PM
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4" is all you really need but 5" does look and sound great. Check out the promotions we have going right now, MBRP gets my vote for the best 6.0L kit. Feel free to give me a holler with any questions you may have.
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Old 04-28-2010, 02:06 PM
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i would stick to a 4" straight pipe unless he wanted that lil bit lower droan
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