remove stock muffler
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Freshman User
Joined: Jul 2004
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remove stock muffler
would it be worth it to remove the stock muffler and cat and just run strait pipes for a while till I would get a new exhaust? Have my mig welder handy I could just cut them out and splice ina new piece in no time. Would it be way loud and would cause flutter?
New User
Joined: Jul 2004
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are you getting a stock muffler again? it sure would be a little more noisy but you might even like it. without your cat your propably going to blacksmoke alot more but there is nothing wrong with that. i would recomend puttin some stacks on.
Posting Guru
Joined: Feb 2004
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From: IOWA
Cut it all out!!!!! 
I cut out both cat and muffler on mine, really liked the new sound. It was rather loud though, I got a stainless steel turn down tip for it and from the cab, it is a lot quieter, but I can still hear the turbo scream. I'm guessing just blowing the exhaust at the ground helped muffle it, plus I get cool points for having a SS tip!!
It won't smoke any more with or without the cat, I don't know the purpose of it, I don't think it serves one, so it should be removed!
I cut out both cat and muffler on mine, really liked the new sound. It was rather loud though, I got a stainless steel turn down tip for it and from the cab, it is a lot quieter, but I can still hear the turbo scream. I'm guessing just blowing the exhaust at the ground helped muffle it, plus I get cool points for having a SS tip!!
It won't smoke any more with or without the cat, I don't know the purpose of it, I don't think it serves one, so it should be removed!
Elder User
Joined: May 2004
Posts: 637
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From: Forest Hill, MD
Yeah yank the cat and muffler. It won't smoke anymore without the cat. It will be considerably louder but both my PSDs have straight pipes,and I love the sound. On my 99 I just cut it off in front of the cat put on a 3.5 to 4 inch adapter and ran 4 inch out the side in front of the rear tire. If you run it all the way out the back it will probably be a little quieter then my setup.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
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From: Rio Rico, AZ.
What I did on mine was to peel the shell open, remove the guts and weld the shell up again. You'll need an air hammer and chisel bit to cut the baffles out unless you want to really open it up and use a torch or cutoff wheel. It added very LITTLE noise at all because the entry and exit were displaced from each other and the sound waves have to turn a corner to get out of the muffler can. It removed a lot of back pressure, I can tell by my butt-o-meter. Welding the shell back up required a lot of patience and finesse with the wirefeed because of the thin metal. Low heat and slow wire is what finally did the trick.
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Freshman User
Joined: Jul 2004
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Thanks definetlty going to do, I will be buying a exhaust sometime but for now I think I will take the cat out and gut the muffler like it was suggested let ya all know how it went, I used to luv the old glasss packs and such so the sooound shouldnt bother me, if i screw it up just have to get a exhaust sooner than planned, just wont get a clothes washer is all!!!(she wont like that LOL LOL)
More Turbo
Joined: Dec 2003
Posts: 571
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From: hondo
Whats the benefit of removing the muffler and cat? Besides releaving back pressure, Does it effect torque or gas milege?
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Posting Guru
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From: NorCal
Originally Posted by tuckr
... just wont get a clothes washer is all!!!(she wont like that LOL LOL)
How do you do it then??? Washboard??? 
I was told to keep your cat. Don't gut it or throw it away. It'll cost you $800 bucks if you ever do need it.
Elder User
Joined: Jul 2004
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From: Leesburg , Fl.
I run 3.5 straight pipe on my 86' 6.9 , sounds so good now I'm thinking of doing the same with my 96' 7.3 . I would like to know who makes a pipe to replace the converter ? I like the idea of running stacks too !
Senior User
Joined: Apr 2004
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From: Roaring Branch, PA
anyone ever try putting in a quick connect of sorts where the cat & muffler are supposed to go just in case the day ever comes that it's mandatory so that a quick and easy switch can be made before and after inspections?
Elder User
Joined: Jul 2004
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From: Leesburg , Fl.
Turbo whistle
My 86' doesn't have a turbo , but I had a White/GMC with a 430 hp. Detroit that sounded sweet ! The 7.3s I've heard with a straight pipe also have a nice sound and yes you can hear the turbo whistle .
Posting Guru
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From: IOWA
Originally Posted by paramedic624
How loud is the straight pipe? I have stock exhaust now and I am looking to make my turbo LOUD----I can hardly hear whistling like I want.....
I want a loud turbo
I want a loud turbo
