another exhaust ?
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Junior User
Joined: Apr 2004
Posts: 68
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From: Jacksonville, Florida
another exhaust ?
I have an 81 f-150 custom 4x4 that is about to recieve a brand new 351w and headers, my question is how should I route the dual exhaust?
I was thinking just straight pipe out the rear, but I have the side mount gas tank and I think the tubing would come a little to close for my liking. So I was thinking of using straight pipe for a little bit then running an offset turbo muffler of some sortand then route the exhaust out the rear.
What do ya'll think of this. I was looking for pre fabricated exhausts for the header application on jegs but found none. That would have been nice though.....oh well.
thanks for any input
I was thinking just straight pipe out the rear, but I have the side mount gas tank and I think the tubing would come a little to close for my liking. So I was thinking of using straight pipe for a little bit then running an offset turbo muffler of some sortand then route the exhaust out the rear.
What do ya'll think of this. I was looking for pre fabricated exhausts for the header application on jegs but found none. That would have been nice though.....oh well.
thanks for any input
Lead Driver
Joined: Dec 2002
Posts: 5,491
Likes: 16
From: Kuna ID
A good shop should be able to bend it right for you, probably have to run both pipes under the passenger side just to get around the T-case, then you can have them go just about anywhere once they get over the axle. My 85 F-250 is set up that way. You could also run them both out the passenger side in front of the rear tire.
Senior User
Joined: Nov 2000
Posts: 201
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From: Drayton, ND
I agree with Sycostang67. Take it to a good shop and let them have a go at it. I took mine and was able to stand there while they asked me questions about where I wanted mine routed. Cost less than $200.
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Junior User
Joined: Apr 2004
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From: Jacksonville, Florida
I would take it to a shop, but I'm doing this project on a budget right now(being a college student sucks sometimes), but for the moment do you think that my idea would work? and what if I was to put some type of heat shielding along the gas tank, would that help or hurt the situation?
I would like to eventually take it toa shop and have them fab up a true dual exhaust with 3in pipe and flowmasters. But that has to wait for some $$$$$$$
thanks
I would like to eventually take it toa shop and have them fab up a true dual exhaust with 3in pipe and flowmasters. But that has to wait for some $$$$$$$
thanks
Last edited by ford_muddbilly81; Feb 1, 2005 at 10:34 PM. Reason: forgot to say thanks
Lead Driver
Joined: Dec 2002
Posts: 5,491
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From: Kuna ID
Could you even get the pipe past the T-case on the driver side? I am guessing it's a pretty tight fit. I had a dodge with the exhaust routed that way, and the pipe rubbed the t-case all the time. Even then I believe some tube bending will be required. Maybe you could get a shop to just do the first part off the headers, then do the rest yourself. I know being on a budget sucks, I had set aside $1000 to get stacks put on my new F-250, and ended up spending it to get the front end rebuilt. I scrapped together $200 to get my muffler removed and have the exhaust dualed the rest of the way out. It's not stacks, but it still sounds nice.
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Junior User
Joined: Apr 2004
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From: Jacksonville, Florida
lets say i use my idea and use a offset inlet center outlet muffler, or center inlet offset outlet, do you think that might give me enough clearence? If not I'm sure I could jerry rig something temporary out of some 180 mandrel bends, maybe route a curve around the t-case and then straighten it out to come out the rear.
Thanks
Thanks
Lead Driver
Joined: Dec 2002
Posts: 5,491
Likes: 16
From: Kuna ID
The hardest part is getting the pipe around the t-case, if you can do that, then go for it. As long as it doesn't leak and gets the exhaust away from the cab, I'd say it was a good job. 
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Junior User
Joined: Apr 2004
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From: Jacksonville, Florida
I appreciate all of your help Sycostang67, the swap isn't happening until march 4, so Im trying to get all of the bugs worked out before then. thanks for the advice. what do you think about putting some sort of heat shielding along the gas tank? Would that help to keep some of the heat away from it. A guy I work with says that he ran his exhaust on a gmc in a similar way and says it should work, and he thought that the heat shielding was a pretty good idea.
thanks again
thanks again
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Lead Driver
Joined: Dec 2002
Posts: 5,491
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From: Kuna ID
You could get some of that insulation the race guys put on there headers, that should work good. Another thought, you could run the exhaust along the outside of the frame under the body. The part of the pipe that crosses over shouldn't hang any lower than your radius arm brackets, if you can find a place to easily cross it over. I saw this setup on a GMC a while ago, not sure if it could work on a Ford, but it's just another idea. 
Fleet Mechanic
Joined: Jan 2005
Posts: 1,413
Likes: 14
From: cape may county NJ
exhaust
I have done a lot homework on this I have a 84 f 250hd ext cab 4x4 460 talked to a lot shops and ford truck owners and the best and safest way is to run both pipes down the passenger side to much stuff in the way on driver side unless you go outside the frame rails I have 3" bus exhaust that runs on the outside frame rails, only downfall is if you want to put on nerf bars the exhaust will be in the way
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Junior User
Joined: Apr 2004
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From: Jacksonville, Florida
I've come to a decision about the exhaust debate. we're gonna run straight pipe down from the headers then mufflers, and dump it right in front of the rear wheels, that solves going over tha axle. and I belive that we are gonna run it outside of the frame so there will be little chance of heat related problems. I' might still put some insulation around the tank though, just in case
thanks for your help
thanks for your help
Senior User
Joined: Nov 2000
Posts: 201
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From: Drayton, ND
Mine was run like GLENNFORDX4 said. It comes out the headers then goes to inside passenger frame rail back to rear axle where one continues straight back and the other goes diagonally over the pumpkin. It works fine.
Senior User
Joined: Dec 2004
Posts: 107
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From: NE TN
I purchased my 85' F250 with dual 4 inch stacks on Flowmaster 2 3/4 " dual exhaust. True dual exhaust from front to side and its loud. My exhaust is mounted to the frame along the tranny and transfer case and then turns out at the rear of the cab and is mounted along the rear of the supercab and in front of the Flatbed. The exhaust does not move. I will take some photo's of the installation and post them in my gallery.