Exhaust Size Inquiry
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Joined: Feb 2013
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Exhaust Size Inquiry
Hey guys.....first time posting here. Just wanted to say this site is invaluable with all the information and expert advice I found here.
I know the 4" vs 5" topic has been beat to death. I was reading through a bunch of the threads and didn't find an answer to the question I have. Based on some past experience in plumbing, this is my understanding. A system can only flow as much as the smallest restriction in said system. So, if that is true, and my end plan is having a 4" downpipe on my new turbo.....nothing larger than 4" exhaust should benefit any performance gains. Is that a true statement....or am I off my rocker?
Please keep in mind that I have a performance goal in mind for this truck, not a cosmetic one. So, the sound/look side of this discussion isn't really relevant to me.
Thanks again for all the great info guys!
I know the 4" vs 5" topic has been beat to death. I was reading through a bunch of the threads and didn't find an answer to the question I have. Based on some past experience in plumbing, this is my understanding. A system can only flow as much as the smallest restriction in said system. So, if that is true, and my end plan is having a 4" downpipe on my new turbo.....nothing larger than 4" exhaust should benefit any performance gains. Is that a true statement....or am I off my rocker?
Please keep in mind that I have a performance goal in mind for this truck, not a cosmetic one. So, the sound/look side of this discussion isn't really relevant to me.
Thanks again for all the great info guys!
Post Fiend
Joined: Dec 2009
Posts: 15,505
Likes: 18
From: Livoina,La
4" DP TO 4" exhaust. The no you don't need any bigger.
3" DP to 3" exhaust won't flow what a 3" to 4" will.
Remember exhaust bouncing of the walls of the pipe and bends in the pipe cause restriction.
There is really no need to go bigger then 4" exhaust unless you want a deeper sound.
3" DP to 3" exhaust won't flow what a 3" to 4" will.
Remember exhaust bouncing of the walls of the pipe and bends in the pipe cause restriction.
There is really no need to go bigger then 4" exhaust unless you want a deeper sound.
Cargo Master
Joined: Jul 2006
Posts: 2,756
Likes: 38
From: Nampa, ID
I have a 3.5" (I think it was advertised as 3.5") downpipe, stock cat con, and 4" exhaust / muffler exiting at the stock location. I'm quite happy with this setup.
It's a Diamond Eye system. I'm NOT happy with the installer nor the company, but that's an entirely different story. If I had it to do over, I'd go with MBRP.
It's a Diamond Eye system. I'm NOT happy with the installer nor the company, but that's an entirely different story. If I had it to do over, I'd go with MBRP.
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the_auto_tech
6.0L Power Stroke Diesel
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Mar 25, 2013 09:18 PM
