Exhaust modification
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New User
Joined: Sep 2008
Posts: 4
Likes: 0
From: Western Washington
This is my first Diesel so im learnin as i go. What can i do wit the cat? Theres a mod i can do wit with the cat?? It has stock 3" and i want to go wit 4" will i have to change the cat or can i upsize after the cat??
Elder User
Joined: Feb 2007
Posts: 898
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From: scaggsville, md
get the down pipe. and replace everything from the new pipe back with 4 inch pipe. completely different sounding. then get the 6637 mod. then will decide the best way to spend you money past there. haha
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
. If the guts of the cat were to....cough, cough, fall out of it and then mysteriously a 3" pipe were welded through the cat, from the opening to the exit, well.....There is no requirements for a muffler unless you don't like the nice low rumble and whistling turbo coming out of the pipe LOL
FOREIGN GURU
Joined: Jul 2006
Posts: 7,655
Likes: 7
From: Celaya, Gto. MX
Senior User
Joined: Jun 2008
Posts: 151
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From: Charleston, SC
o man. i live in MI, don't know the emissions rules here and don't care. i love to smoke out every rice burner or chevy i can find. as soon as i bought my truck i cut the muffler right off, straight pipe. its got a mean sound and i personally believe the more a diesel can "breathe" the better it can run. big air intake & no restrictions on exhaust.
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Senior User
Joined: May 2008
Posts: 157
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6637 for sure!! ive joined the performance perade,, and i just put on my 6637, it has opened so many doors, i am now looking into putting a down pipe and exhaust system on..
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Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
No cat = no license plate. We don't have those tests here in MI...for now
I hope you kept the cat, there is talk of emission testing returning to MI.
Posting Guru
Joined: Apr 2004
Posts: 1,424
Likes: 0
From: AZ
Well I just change the stock exhaust (3.5") to 4" and when I saw the inside of the muffler I noticed that there is a decrease in diameter inside of the muffler I think to 3", and I supposse that that will afect in some way the flow thru muffler, the new muffler (magnaflow) has exactly the same diameter from front to back all the way
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wosborn
1948 - 1956 F1, F100 & Larger F-Series Trucks
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Mar 29, 2006 02:40 AM
