dual exhaust issues
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Senior User
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dual exhaust issues
heres the deal i bought a couple thrush glasspacks, pipe and tips to put true dual exhaust on my 92 302 but no shop in town will bend the pipe for me, because the angles going to the manifolds are too steep. i was thinking about cutting the pipe after the y-pipe and then putting a thrush glasspack on, then adding another y-pipe and make a non true dual system but how do you think i should go about it? will it still be loud?
Posting Guru
Joined: May 2012
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From: Franklin, IN
Talk to someone that knows what they are doing, because it sounds like your local shop techs do not. I have a 302 in my 4x4 with factory truck manifolds and there is PLENTY of room around my dual exhaust.
If you do decide to simply run a dual exit exhaust you won't get the exhaust note a true dual exhaust would give, but it should be similar in volume.
If you do decide to simply run a dual exit exhaust you won't get the exhaust note a true dual exhaust would give, but it should be similar in volume.
Posting Guru
Joined: Jan 2004
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From: Charlestown, RI
Two problems that I see with this:
1) You didn't mention cats. It's against federal law for a shop to remove cats.
2) You bought your own parts and brought them to a shop to install. You wouldn't bring your own burger to McDonald's would ya?
1) You didn't mention cats. It's against federal law for a shop to remove cats.
2) You bought your own parts and brought them to a shop to install. You wouldn't bring your own burger to McDonald's would ya?
Lead Driver
Joined: May 2011
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heres the deal i bought a couple thrush glasspacks, pipe and tips to put true dual exhaust on my 92 302 but no shop in town will bend the pipe for me, because the angles going to the manifolds are too steep. i was thinking about cutting the pipe after the y-pipe and then putting a thrush glasspack on, then adding another y-pipe and make a non true dual system but how do you think i should go about it? will it still be loud?
if it were me, I wouldn't be re-working the entire exhaust without adding long tubes.
furthermore, true duals are counterproductive in a street truck application. you will produce more low end torque with a y pipe application anyway, so if its easier to bail on the true dual idea now than it is to finish it, it will only be advantageous all across the board.
Lead Driver
Joined: May 2011
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No single modification will remedy the pathetic performance of your 460. Head, cam, long tubes and is how you unleash a monster. Or a poweradder.
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Post Fiend
Joined: Oct 2003
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From: Western Central NV
If all you want is loud just run off the manifolds. Don't waste money on parts you don't need.
Craig
Craig
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Postmaster
Joined: Nov 2011
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From: SW Florida
Well, if you have cats and want them gone, no shop will touch it. Might make up an excuse even... like "the angles are too steep". If you pull up to the shop and discover that your cats fell off on the way there however, they might work with you. Or you could run some hi-flow cats, which are way better than the factory ones.
Also, if you don't want a Y pipe you could run an X or H pipe. These promote scavenging, while letting you have true duals.
I'd get rid of the factory iron manifolds before I even considered messing with the rest of the exhaust.
And as mentioned above, if you just want to be loud, run straight off the factory manifolds into a 90 degree turndown. I bought my 460 truck like that... and you could hear that coming from miles away.
Also, if you don't want a Y pipe you could run an X or H pipe. These promote scavenging, while letting you have true duals.
I'd get rid of the factory iron manifolds before I even considered messing with the rest of the exhaust.
And as mentioned above, if you just want to be loud, run straight off the factory manifolds into a 90 degree turndown. I bought my 460 truck like that... and you could hear that coming from miles away.
More Turbo
Joined: Dec 2007
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From: Umicorn UtopiaFantasyLand
Y pipes promote scavenging from one bank to another. True duals are completely pointless (and net a loss in performance) until the y becomes a flow restriction, which with even 2.5" pipe would be too high of rpm to matter for a street truck. With a 3" or larger y, its a matter of "if" the y would ever become a restriction in the real world, vs "when", even in a drag application.
No single modification will remedy the pathetic performance of your 460. Head, cam, long tubes and is how you unleash a monster. Or a poweradder.
No single modification will remedy the pathetic performance of your 460. Head, cam, long tubes and is how you unleash a monster. Or a poweradder.
Thanks!
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Senior User
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And as mentioned above, if you just want to be loud, run straight off the factory manifolds into a 90 degree turndown. I bought my 460 truck like that... and you could hear that coming from miles away.[/QUOTE]
i could do that but in town the cops would have my @$$ LOL, i'll consider risking that though
i could do that but in town the cops would have my @$$ LOL, i'll consider risking that though
Tuned
Joined: Jan 2013
Posts: 398
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From: Vancouver Island BC
I'm tempted to just slap a 90* turndown right after the cat on mine... Not sure how obnoxious it would be though. I've heard that these cats are nearly mufflers in themselves? You might wanna try that first and save yourself some $$$
You keep saying you want it loud... Well then, chuck the mufflers in the trash, because loud = STRAIGHT PIPES
With mine, I might pick up a thrush welded or something before I hack the factory muffler off, just in case I need to put it on there.
I'd rather pull the cat, gut it, slip a pipe inside, and then put a catback system on, but not gonna happen at the moment
Putting "dual" glasspacks like your're planning wont get you what I want I don't think...
You keep saying you want it loud... Well then, chuck the mufflers in the trash, because loud = STRAIGHT PIPES
With mine, I might pick up a thrush welded or something before I hack the factory muffler off, just in case I need to put it on there.
I'd rather pull the cat, gut it, slip a pipe inside, and then put a catback system on, but not gonna happen at the moment
Putting "dual" glasspacks like your're planning wont get you what I want I don't think...
Laughing Gas
Joined: Aug 2010
Posts: 983
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From: Northern Kentucky
"I'm tempted to just slap a 90* turndown right after the cat on mine... Not sure how obnoxious it would be though. I've heard that these cats are nearly mufflers in themselves? You might wanna try that first and save yourself some $$$"
Island'r:
My 351W has about 3 ft. of 3 inch pipe after the cat, just enough to route exhaust out the side of the truck using a 90 degree bend, and it is not very loud at all.
Island'r:
My 351W has about 3 ft. of 3 inch pipe after the cat, just enough to route exhaust out the side of the truck using a 90 degree bend, and it is not very loud at all.