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exhaust routing

how do i route the exhaust

  • single out the side in front of the rear driver tire

    Votes: 10 58.8%

  • turndowns right after the muffler under the truck

    Votes: 7 41.2%
  • Total voters
    17
wannabehero

wannabehero

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alright so when i got my truck the exhaust was stock and rotted. naturally i gutted it and not thinkin did a single into a dual outlet flowmaster 40 and straight out the back.

now i cant use the back window unless i wanna pass out and it just so happens where the military cucv clevis hooks hang is right where the exhaust exits and they constantly bang against one another. just a tad annoying.

so me and pops were talkin and we decided to just get the exhaust away from the rear of the truck.

i though to just cut it right before the muffler and have a 90 degree bend and have it exit right before the driver side rear tire.

my dad said to get 2 turn down tips and put them right ater the dual muffler exits.

loud doesnt matter to me. im leanin towards the single side exit only because im thinkin if it dumps under the truck fumes are still gonna work there way into the truck

im leavin it up to the ck5s
 
Right after the muffler will smoke you out too, I had mine like that for a while and it was annoying. I would run it either in front of or behind the rear tire. I have a 3" single mounted right next to the frame with a 45* down at the end and it doesn't bother me I have no roof though so that might effect the flow
 
so im right in thinkin that cuttin it right before the muffler and eliminating the muffler and everything behind it and just havin a 90* bend to exit right before the tire is best?
 
I read some where that AFTER the tire was better for our trucks.For having the top off or window down. My exaust is like yours , so Im gonna have them cut and exit after the tires.
 
My vote is a single 3" exhaust and having it exit on the drivers side behind the rear tire at a 45* angle. With the rear window down you "might" get a little axhaust in the vehicle depending on how close you keep the tip to the body and also playing with the angle slightly will help.
 
why not before the tire?
only reason i say this is because im trying to make this as simple and cheap as possible.

i dont have a welder either so to run a length of pipe like that i would have to have it done somewhere.

i figured i could use the 90* degree bend i got and just use an exhaust clamp.
 
Exiting the exhaust before the tire is going to go dump exhaust fumes into your passenger compartment. IIRC it is also required by law to exit behind the rear tire and never to the rear on any vehicle which has a rear window that can be opened as that would allow exhaust gases to enter into the passenger compartment as well.
 
alright i didnt think about it comin in thru the drivers window.

now im thinkin maybe i should go get another 90*bend and keep the system i have now but cut it and use the bends so both sides would now exit behind the rear tires.
 
A single 3" exhaust will make more torque down in the lower RPM's than a true dual exhaust.
 
its not a true dual set up.
its the facory y pipe
then a cat
then a single 3in pipe
into a flowmaster super 40 with dual 2.5in outlets.
 
I got you. You could save a little coin though by just going with a single 3" outlet on the drivers side, less material and less work.
 
the setup i just described is in already. got it done a while back.

i know the local auto parts place sells 90*bends.

i was thinkin i got two and just cut the pipe before it exits and put a bend on each side so it would know exit at the sides of the truck
 
no exhaust comin in thru the drivers side window?
i have solid windows in the top so that solves that problem before it arises

if i go that route i would have it make the bend either right before or underneath the front mount for the rear springs
 
I have duals running under my doors and exiting right in front of the rear tires. When stopped at lights or idling with the windows open, you do get some exhaust fumes into the vehicle. On mine there are two 90* bends getting to the mufflers and then one 45* to kick it out the side. I would not recommend this setup to anyone. First it rots much faster than having the exhaust under the truck, and second they rattle badly. There is also the issue of extra heat on the tires, since you would have to put another 90 into it to clear the tires, and you would have to put it a ways out from the body.

All in all I am going to put duals that run out behind the rear tires. The other issue is that with my setup I can't run sliders, since they would be in the same space currently occupied by the exhaust.

If you want to see some pics, just jump into my blog and I have quite a few that show the exhaust.
 
Good point about the sliders. I never even thought about that as being a factor for someone wanting to dump the exhaust in front of the tire.
 
On my 6.2, with the diesel fumes being much more noticable than a gasser, I've had several different setups. The OEM duals that dump out behind the rear tires at about 90*, duals that exit straight out the back (tips just past the bumper), the same but the tips removed so it exited before the rear bumper, and now with dumps pointed between the rear axle and fuel tank.

Never noticed any fumes with the stock setup. With them straight out the back it was quite noticable with or without the tips. With the dumps it was noticable but not as bad, which I attributed to the fumes dispersing more before coming in the back window. Oddly enough, with the top off fumes were never much of an issue with any of the setups which I attribute to the substantial change in aerodynamics as it is no longer suck air into the back window directly from behind the vehicle.

Never tried side exits in front of the rear tires, but I would think you could have issues crushing the exhaust since it would have to route under the lowest part of the frame and thus be vulnerable. Street driving or really mild trails shouldn't be a problem, but I know on my truck side exits like that would of been crushed and torn off several times.
 
I've had four different setups on my 71.

True duals going straight out the back: I might have died if I continued to drive it with the top off. Even with the top on, fumes would get sucked in from somewhere.

True duals pointing to the sides behind the rear tires: Better than out the back but still a lot of fumes.

True duals exiting behind the rear tires but at a 45 degrees: Better than above and I could almost tolerate the fumes that were left.

Single exhaust exiting passenger side at 45 degrees with a turndown to dump right behind the rear tire: Best of all. No real noticable fumes unless you idle in one spot for more than 10 minutes.
 
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