4inch exhaust or 5inch - Ford Powerstroke Diesel Forum
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Old 03-24-2013, 10:35 AM
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4inch exhaust or 5inch

Hey I was planning on putting a 5inch exhaust on my OBS to reduce back pressure and to pave the way for more mods here in the future. My buddy said he had the 5inch and cause the turbo to get air due to lack of back pressure? Is there any truth to this or has anyone had a 5inch with any troubles or feedback. Let me know guys so I not waste some money!! thanks
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Old 03-24-2013, 10:51 AM
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The guy is an idiot. Diesels need as little back pressure as possible.
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Old 03-24-2013, 11:46 AM
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The turbo creates all the back pressure you need, agreed your friend is not all there up stairs
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Old 03-24-2013, 03:35 PM
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I have noticed a different sound between the 4 and 5 inch, 4 is more whistle, 5 is more roar. on the subject of back pressure, you should look into that as much as you look into the spark plugs on your truck or a radiator for a 60's vw.....
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Old 03-24-2013, 05:24 PM
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HAHA thanks guys, I thought it sounded wrong but just wanted to check it out!!! thanks for the info, I believe 5 it is!!!
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Old 03-24-2013, 07:41 PM
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Quote:
Originally Posted by svranger25 View Post
I have noticed a different sound between the 4 and 5 inch, 4 is more whistle, 5 is more roar. on the subject of back pressure, you should look into that as much as you look into the spark plugs on your truck or a radiator for a 60's vw.....
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