Stock Exhaust
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New User
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Stock Exhaust
OK - here comes a stupid question, but I just gotta ask...
I have noticed that the exhaust on my 06 PSD is mounted in sections, downpipe from Turbo to the Cat sections to the Muffler section......
I also see alot of folks byuing new exhausts, some for looks, others for lower EGT's, that makes sense especially with a tuner. Many are running straight pipes, which assume means turbo back is a cat-less, muffler-less setup?
Couldn't you just unbolt the muffler and cat sections on the stock setup and acheive the same thing? Albeit, not as good looking and a smaller O.D. exhaust, but wouldn't it help the motor to breath more, just like the aftermarket stuff?
Let me know, before I remove something, I want to know if I would be hurting anything?
I have noticed that the exhaust on my 06 PSD is mounted in sections, downpipe from Turbo to the Cat sections to the Muffler section......
I also see alot of folks byuing new exhausts, some for looks, others for lower EGT's, that makes sense especially with a tuner. Many are running straight pipes, which assume means turbo back is a cat-less, muffler-less setup?
Couldn't you just unbolt the muffler and cat sections on the stock setup and acheive the same thing? Albeit, not as good looking and a smaller O.D. exhaust, but wouldn't it help the motor to breath more, just like the aftermarket stuff?
Let me know, before I remove something, I want to know if I would be hurting anything?
Senior User
Joined: Dec 2003
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From: Florida
re
You certainly can eliminate the Muffler and replace it with a 3.5 inch pipe.
You can try to find someone to eliminate the Catalytic Converter and replace
it with a 3.5 inch pipe. Most muffler shops will not touch this elimination as it
is a state/federal offense. If you do find some guy in the boonies that will do it for you be sure to keep the converter for the future. They are extremly expensive and you may need to sell your truck someday. I did exactly this with my 2003 6.0 dually. (Traded in for a 2005). The whistle was pretty extreme and the noise was a bit loud. I have never changed the down pipe from the turbo, too expensive and I am afraid Ford would poo poo any warranties. One plus in all this; it is pretty affordale to do it this way and when you do step up to a 4 or 5 inch system the converter will already be gone and any muffler shop will be happy to sell you a complete system.
You can try to find someone to eliminate the Catalytic Converter and replace
it with a 3.5 inch pipe. Most muffler shops will not touch this elimination as it
is a state/federal offense. If you do find some guy in the boonies that will do it for you be sure to keep the converter for the future. They are extremly expensive and you may need to sell your truck someday. I did exactly this with my 2003 6.0 dually. (Traded in for a 2005). The whistle was pretty extreme and the noise was a bit loud. I have never changed the down pipe from the turbo, too expensive and I am afraid Ford would poo poo any warranties. One plus in all this; it is pretty affordale to do it this way and when you do step up to a 4 or 5 inch system the converter will already be gone and any muffler shop will be happy to sell you a complete system.
New User
Joined: Aug 2006
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From: Clovis, NM
I have deleted my muffler and cat on my stock 2006 F250 and had the muffler shop install a 3.5" pipe in there place. If you like the sound of a small jet sitting on the runway at idle speed, then you will love the sound of your truck when it idles. Also, you will love the sound you get from it when you take off from a stop. The sound is not bad at all in the cab, but the folks around you will know your there.
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Redly76 - On my 06 crew cab, Stock- I have a turbo down pipe that is attached to a cat and that is attached to a small section of straight pipe that is attached to the muffler which has the tail pipe attached(welded). It appears that it would be fairly easy to disconnect the downpipe from the cat and remove everything else downstream. Of course, that will only leave me with a straight pipe that exits under the front door area of the main cabin. I could also leave the cat connected and the (24inch or so) piece of straight pipe connected but just remove the muffler and tail pipe, this setup would effectively make the exhaust exit under the truck. Would I need a tip or could I just leave it the way it is?
Also, at idle, would I get alot of fumes in the cabin?
Is no muffler and a cat better than no cat and a muffler?
If the cat is still inline, removing the muffler makes how much sound difference?
Thanks for the help.
Also, at idle, would I get alot of fumes in the cabin?
Is no muffler and a cat better than no cat and a muffler?
If the cat is still inline, removing the muffler makes how much sound difference?
Thanks for the help.
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Well - I did it, my muffler (fell off) after much work. DANG, the truck sounds 20 times better. Still have the Cat in place and the mid pipe section that attaches to the muffler section. SOUNDS AWESOME. Not too loud, really only noticeable when I am accelerating hard. At cruise speed, sounds the same as original.
Reminds me alot of my 1999 5.4L Expy I had before this truck. It had dual exhaust and had a Flowmaster muffler with cat still in place.
This really does sound nice.........
Could get real brave and remove the Cat to see what a straight pipe sounds like, but I'll leave it alone for now.
Reminds me alot of my 1999 5.4L Expy I had before this truck. It had dual exhaust and had a Flowmaster muffler with cat still in place.
This really does sound nice.........
Could get real brave and remove the Cat to see what a straight pipe sounds like, but I'll leave it alone for now.
FTE Remembers
Joined: Jul 2005
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From: Millersville, MD
I too did only a muffler delete. Replaced muffler with a purchased pipe. Sounds GREAT! If you don't GET INTO IT, it doesn't sound loud at all, esp with windows closed....BUT roll down right side back window and GET ON IT!!! Sounds like a 50's -60's big block with Smitties!!! At idle you can read the turbine whining....kinda like a jet engine in the distance.... If you remove the cat too and replace it with a straight pipe, WOW!! The turbine whine is really there!! Just don't get inspected without the cat...federal offense. I have not heard of ANYONE with a 250/350 being inspected.
Junior User
Joined: Aug 2006
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If you really want a cool sound, try this: I was goofin' around one day and took my entire exhaust off except my downpipe and drove around for a while. Oh man!!! That is the meanest sounding thing I've heard. It sounded waaaaaaaay different that a straight piped truck! I didn't leave it that way, but it was really cool while it lasted!
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Junior User
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I started out my 06 crew F250 with the turbo back but never thought about leaving the factory down pipe on but I think it would have worked with my system. The kit I bought was 4 in straight pipe but only after the cat then I deleted the cat and I have to agree my wife asked if there was a jet dryer in the driveway when she came outside. I like the sound especially under heavy throttle and towing but in pa it needed a muffler so I put on a straight through type diesel muffler and its toned down at idle and is mildly aggressive under acceleration but I did draw lots of attention in town while it was strait piped.
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Senior User
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um to this q im going to answer. If you just delete the cat and muffler you will loose power. To just replace the cat and muffler with strait pipes is wrong. You need to get an after market exhaust system mandral bent tubing and a strait through muffler. Im no expert, but if you read up on this you will see the power diffrence with indepent studies. You need some back pressure with the turbo. Plus the factory 3.5 pipes dont have the same flow factors as the aftermarket pipes do. I mean im talking about 30-40 horse and even more toq. lost and gained with certain pipes, but thats cool if you want just a cheap exhaust that sounds good. Personally i go for power gain aswell as sound.
Hotshot
Joined: Dec 2003
Posts: 15,369
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From: Stuttgart, Ar
smokem331--that's just plain wrong. These motors don't need the kind of back pressure you're talking about. I agree about the mandrel bends in the A/M pipes, but you won't lose power deleting the muffler and cat. I don't know what studies you're reading but I'd like to see them.
P.A.--you should hear an 03 turbo straight piped--talk about a whistle.
P.A.--you should hear an 03 turbo straight piped--talk about a whistle.
Junior User
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I bet partsman I couldn't believe my ears when I finally took the cat off. Man it sounds sweet and the attention you get when you pass someone on the highway or just putting around town. I made me wish I had a 6speed for a little while but I love my auto especially when towing! The nice thing about the powerstroke is its kind of stealthy when just crusing but when its uncorked man look out. 
The funny thing is my wife didn't like the sound but when she drives it she shows off more than me! Gotta love the turbo diesel V8. 
The funny thing is my wife didn't like the sound but when she drives it she shows off more than me! Gotta love the turbo diesel V8.
Senior User
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No im not talking about gas engines. any engine needs some sort of back pressure. whether its a little or a lot it needs something. When i have time i will find the articles and post them
Last edited by smokem331; Oct 14, 2006 at 03:35 PM.
Junior User
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I would think that an exhaust without a muffler and cat that extends a few feet away from the engine would be enough back pressure for most engines. Sure its gonna be loud. I did read on here before that straight pipe exhaust is okay as long as it exits behind the rear axle. It had something to do with moisture getting to the turbo and causing it to rust. Only a dyno can prove the power #'s but I'm sure that eliminating the cat and that massive muffler did with out a doubt give me more power and better spool up. Oh yeah and 1-2 mpg.
