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Outside the framerail exhaust?

muddermilitia

muddermilitia

ThatTrazerGuy
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Anyone ever done this? I was under the truck the other day looking and stuff at I saw that my exhaust will need to be re-routed after the doubler is installed. I want to get my exhaust to route outside the frame rails then after the cab it will go straight up to stacks (only to keep it out of the water). I'm trying to figure the best way of doing this.

I was thinking maybe routing the exhaust under the frame in front of the shackle hangers, but I dunno. :confused:

Ideas?
 
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without looking at one at the moment, i'd guess the only way to route the exhaust to the outside of the frame without putting in a position to be crushed would be to run it near or in the wheelwellpeople with a body lift might be able to route it over the frame.
 
Fenderwell headers are readily available for '73-'79 Ford trucks with the 460 and they fit and clear just fine. You can make them work in a GM just the same way as the Fords have them. Just gotta find someone to do it or have lots of patience and DIY.
 
why go outside the frame rail? Bring it behind the cab, then go up. Going outside the frame means it has to go under the frame somewhere, and that can't be healthy. I would suggest a single stack though to cut down on noise right next to your head. For symmetrics, run a snorkel the same way, but on the other side...
 
The pipes would come out just on top of the frame rails and curve down towards the body mount and then back along the side of the rail to the bottom of the forwardmost bed to which it would shoot upwards to make stacks.
 
where would it go over the frame at? I'm thinking in front of the spring hangers would cause interference issues, and behind them there isn't much room. I could be retarded in my thinking since I am sitting at a work bench, and not in front of my rig.
 
There is some room to bend the tubes to come over the top of the frame rails and then down to the rear. Its been done before and I've seen pics of it. I don't know of any aftermarket fenderwell headers for GM's but custom made headers are out there.
 
box the frame and weld in a piece of 4'' schd 40 thru frame, run pipes thru the 4''schd 40, seen it done on 2wd 1st gen..lowered w/chrome tail pipe stickin thru 1/4 panel cut in front of rear tire with a slant end big daddy?/what we call um..anyw...tailpipe4-5'' exhaust

run thru frame enuff to weld big daddy/big chrome tip cut on slant w/them rotated the longest part of the tip backards so it fit flush on body sides...iirc some trans am cars i've seen run it thru body like that, b/c you can see the soot and crap behind the hole and is ugly, and not good for a twisty truck, but boxing in the schd40 pipe and run thru it out to rear cab corners and up to a stack..i would use splice/bolt connection down around the frame so you can take the stacks off if need be
 
Stahl makes fenderwell headers for our trucks. I would not recommend running exhaust outside the frame though, I bashed mine on rocks until i had to replace with in the frame exhaust, not to mention mud and water getting on it and having to constatly deal with steam off of the exhaust.
 
My exhaust is all outside the frame. Built a set of headers for the Cad 500 to go outside the frame, Tucked up it tight and the slider are underneath it so its well protected, or will be when the belly skid gets put on.
 
35dp said:
Stahl makes fenderwell headers for our trucks. I would not recommend running exhaust outside the frame though, I bashed mine on rocks until i had to replace with in the frame exhaust, not to mention mud and water getting on it and having to constatly deal with steam off of the exhaust.
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hmmm didnt think about water constantly splashing on the exhaust, guess I will have to try and squeeze it in between the frame rails. There's no way any exhaust will be routed on the pass side with the 205 clocked flat
 
Boatside it , mild or wild , your call . Then run the pipes in the boatsiding so you don't bash it before it exits and turns up to the stacks .
 
My truck has the exhaust entirely outside the frame. It comes off the turbo, shoots out and goes down between the inner fender and the frame rail, over top of the shock mount, then follows the curvature of the frame all the way to the back, where it exits just below the box side at 45 degrees out and down. With the bumper on, you can't see the exhaust at all, from the side you just see and inch or two of it.

I have to build a cover for the exhaust as it runs through the rear fenderwell, though it is dead straight with the frame, it still looks a bit crooked for some reason. If it is covered with a black material of some sort, it'd be pretty much invisible.

At no point does it run lower than the frame / body except for where it exits.
 
My exhaust leaves the manifolds and makes a 90* turn to the outside, then the mufflers and exhaust tips sit just in front of the tires. Personally I hate the way it is routed, but I don't have a need for it to be that way.
 
I made a natch in my doubler crossmember and re-routed some of the fuel lines so the exhaust could go down the C of the frame rail. If you wanted outside frame exhaust why not just take a set of headers and cet the pipes between the flange and before they make the first bend then add a length in there to get them over the frame? Get a pip sweller and overlap them a little too
 
What was your decision on this? I'm currently toying with the same idea...Making my own through the fender headers, run down along the frame and running side pipes tucked neatly under the lip on the rocker. Just trying to decide if it's doable...
 
I kept the exhaust between the rails. Ran the pass side forward, under oil pan, then back into the drivers side pipe with a flowmaster merge pipe and then single exhaust back
 
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