4" or 5" Exhuast

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Nov 7, 2003 | 07:23 AM

gdh11

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4" or 5" Exhuast

I just got an 04 3500 and will be loading it up over time, to include HX40, Propane, Box, etc. I used to have a PSD and ran a 4" exhuast on that. Is there a negative side to having to big of an exhaust and is a 5" too big for what I plan to do with it. I just don't want to put a 4" on and then pull it off only to install a 5". Any comments would be appreciated.

Nov 7, 2003 | 09:36 AM

Hoss

Thats MR Hoss to you buddy!

Joined: Jul 2001

Posts: 2,759

Likes: 3

From: Central Texas

Re:4" or 5" Exhuast

I've always heard that unless you're going over 500 HP then a 4" exhaust is all you need....or something like that. :-

Nov 7, 2003 | 09:40 AM

Mark Craig

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Joined: May 2003

Posts: 1,268

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From: Nashvile Tennessee

Re:4" or 5" Exhuast

GDH11,

Checkout the last issue of the TDR, there was an article on when 5 inch is needed and soon. Basically they stated that when you get at the 500 RWHp level you would need the CFM capacity of 5 inch, below that it hurt the low end torque response of the the truck. Just an FYI. Call us if you have exhaust questions or visit our site.

Mark @ DPPI

Nov 7, 2003 | 12:57 PM

Lil Dog

Chapter President

Joined: Feb 2002

Posts: 6,102

Likes: 2

From: Red Deer, Alberta Canada

Re:4" or 5" Exhuast

There is a good thread in the 2nd gen performance area about just this topic. Good information on how the size of the pipe affects performance...

Seems to me the 5" is a waste of dough...

http://www.dodge-diesel.org/yabbse/i...threadid=22079

J-eh