Muffler for stacks?
Thread Starter
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Tuned
Joined: Aug 2004
Posts: 311
Likes: 4
From: Omaha, NE
Muffler for stacks?
Looking to run an exhaust stack on my 4.9l. Why? Cause i think it'd be neat...
Anyways in planning it all out, i was wondering what thoughts were on mufflers in a stack setup? Not super concerned with the actual sound, but am looking for it to be a little quiter that just straight pipe. Not running a cat, so that's not an issue either.
Also, was wondering what kind of vibration dampening people use? Strapping the stack pipe to the body i think would cause unneeded vibration and flexing. Heard/read about using rubber exhaust bends, but figured those would be pricey. Would flexible exhaust pipe ('drier vent') from like Autozone work? Kinda ghetto, but what ever works i guess.
Any thoughts comments are appreciated. Thanks
Anyways in planning it all out, i was wondering what thoughts were on mufflers in a stack setup? Not super concerned with the actual sound, but am looking for it to be a little quiter that just straight pipe. Not running a cat, so that's not an issue either.
Also, was wondering what kind of vibration dampening people use? Strapping the stack pipe to the body i think would cause unneeded vibration and flexing. Heard/read about using rubber exhaust bends, but figured those would be pricey. Would flexible exhaust pipe ('drier vent') from like Autozone work? Kinda ghetto, but what ever works i guess.
Any thoughts comments are appreciated. Thanks
Postmaster
Joined: Oct 2005
Posts: 3,724
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From: Clarksburg WV
You have to use a piece of that flex stuff somewhere between where the stack would attach to the body and frame. You wanna use the good stuff though. I wouldn't count on a rubber exhaust bend lasting very long.
Also I found a site the other night by searching for "exhaust stacks" on google, where they sold inserts for stacks that acted as mufflers.
Also I found a site the other night by searching for "exhaust stacks" on google, where they sold inserts for stacks that acted as mufflers.
Thread Starter
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Tuned
Joined: Aug 2004
Posts: 311
Likes: 4
From: Omaha, NE
Prices for those rubber 90s aren't too bad, kinda surprises me coming from NAPA. I figured i would run 2.5" from the manifolds into a muffler of some sort, then run a bend up to 3" for the stack. Probably have a 2.5" to 3" adapter before the bend. What 'good stuff' would you recommend that wasn't rubber?
Hmm, will have to look into the insert idea, although a regular muffler would probably to me fine, good to have options.
Another question- haven't decided how to run the tip, always though mitred or straight cut looked tougher than curve tops. What is the deal with rain fall? I've seen 6" mitre cut trucks running around, thats like throwing a kiddy pool out during a rain, how do they combat water collection? Thought about a straight cut with a popper...
Hmm, will have to look into the insert idea, although a regular muffler would probably to me fine, good to have options.
Another question- haven't decided how to run the tip, always though mitred or straight cut looked tougher than curve tops. What is the deal with rain fall? I've seen 6" mitre cut trucks running around, thats like throwing a kiddy pool out during a rain, how do they combat water collection? Thought about a straight cut with a popper...
Thread Starter
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Tuned
Joined: Aug 2004
Posts: 311
Likes: 4
From: Omaha, NE
Yeah, figured poppers wold be the way to go, they're not too expensive either. I know you stated you're not sure how it was routed, nebechanezer, but do you know if he ran true duals, or two-one from manifolds, one-two stacks?
Tuned
Joined: Nov 2004
Posts: 338
Likes: 0
wasnt anything special, i think he might have split it after the cat. dual stacks, just plain exhaust pipe, not chrome or stainless. came up thru holes in the bed, might have welded a flange to the pipe and bolted the flange to the bed floor. was all inside the width of the frame, so the stacks sit in a little from the sides. pretty sure he used some flex pipe somewhere. dont think he has any mufflers in it, maybe just the cat, it wasnt as loud as i though it would be, i remember that.
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Posting Guru
Joined: Jun 2002
Posts: 1,214
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From: Rio Rancho USA
Dont use the flexable "drier pipe". It will rust out far quicker than the rest of the exhaust and should only be used as a last resort.
Look under most front drive cars and you will see whats called a flex pipe. It looks like its made of the same material steel braided hose is. It will last forever and allow the exhaust to move without moving the stack. It will cost a little more, but it will be worth it.
Install a muffler after the manifolds and drill a small hole at the bottom of the stack for water to drain.
Look under most front drive cars and you will see whats called a flex pipe. It looks like its made of the same material steel braided hose is. It will last forever and allow the exhaust to move without moving the stack. It will cost a little more, but it will be worth it.
Install a muffler after the manifolds and drill a small hole at the bottom of the stack for water to drain.
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Lead Driver
Joined: Dec 2002
Posts: 5,491
Likes: 16
From: Kuna ID
I think the mitre cut stacks are better looking, but the curved tops help keep water out. Water isn't really that big a problem as any that does get in the pipe evaporates after the pipe warms up. Birds are a bigger problem for me, at least it doesn't take much to launch the carcass out of the pipe. 
I ran my exhaust on the outside of the frame and actually gained ground clearance over the stock setup. I also have some of the stainless braided flex pipe. There are a few pics in my gallery. I have had the stacks for over 1 year, and the only problem is that the rubber bushings that isolate the stacks from the bed keep melting. I may try some poly bushings next. Also, the larger diameter the stack(s), the louder it will be.
I ran my exhaust on the outside of the frame and actually gained ground clearance over the stock setup. I also have some of the stainless braided flex pipe. There are a few pics in my gallery. I have had the stacks for over 1 year, and the only problem is that the rubber bushings that isolate the stacks from the bed keep melting. I may try some poly bushings next. Also, the larger diameter the stack(s), the louder it will be.
Last edited by Sycostang67; Dec 18, 2006 at 09:25 AM.
Lead Driver
Joined: Dec 2002
Posts: 5,491
Likes: 16
From: Kuna ID
Originally Posted by tjc transport
i got mine from a place called the chrome room or chrome shop on e bay. they get $60 each for 48 inch stacks.
just search chrome stacks.
just search chrome stacks.
Heres a link for ya.
http://stores.ebay.com/CHROMEROOM
Senior User
Joined: Oct 2001
Posts: 268
Likes: 0
From: North Texas
Originally Posted by fattmann
Prices for those rubber 90s aren't too bad, kinda surprises me coming from NAPA. I figured i would run 2.5" from the manifolds into a muffler of some sort, then run a bend up to 3" for the stack. Probably have a 2.5" to 3" adapter before the bend. What 'good stuff' would you recommend that wasn't rubber?
Hmm, will have to look into the insert idea, although a regular muffler would probably to me fine, good to have options.
Another question- haven't decided how to run the tip, always though mitred or straight cut looked tougher than curve tops. What is the deal with rain fall? I've seen 6" mitre cut trucks running around, thats like throwing a kiddy pool out during a rain, how do they combat water collection? Thought about a straight cut with a popper...
Hmm, will have to look into the insert idea, although a regular muffler would probably to me fine, good to have options.
Another question- haven't decided how to run the tip, always though mitred or straight cut looked tougher than curve tops. What is the deal with rain fall? I've seen 6" mitre cut trucks running around, thats like throwing a kiddy pool out during a rain, how do they combat water collection? Thought about a straight cut with a popper...
And by all means use a rubber-isolated mount where you attach to the cab. If possible, use a stiffener, like a piece of 1/8" flat stock, inside the backwall where your bracket attaches.
And you were kidding about the "rubber" elbows, right? Right?
You do know that heat melts rubber, and that exhaust is hot?