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  #1  
Old 03-25-2008
rededge02's Avatar
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Dumped Exhaust ?'s

1. Is it safe fume wise to do it if the muffler is in a simular location to the stock one?
2. Is a turndown tip necessary or can i just run it straight out of the muffler?
3. Will the fumes corrode the stuff underneath?
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  #2  
Old 03-25-2008
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this is my third truck w/ dumped exhaust, and i've never had a fume problem, and they've all been in the factory location, i also never had a problem with corrosion either. as far as turn downs, i had my 40 series straight out the muffler on my 150, and it melted my shock boot. i guess if nothing meltable is in the direct path you'd be fine
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Old 03-26-2008
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This is my third truck as well with dumped exhaust. No problems with melting or anything like that. No problems with fumes, except when you gotta be under there working while its running for some unknown reason.....but that's very very seldomly. All of my rigs that were dumped, the muff's were in the stock location, and always a Flowmaster 40 of some kind(super40, original40).

I would suggest a turn down, makes the truck sound better from the outside, and espicially brings the interior resonance down quite a bit compaired to no turn down.

I am plannning on a dual out muff next time, with tailpipes, but dumped just before the hitch. Nice and clean.
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  #4  
Old 03-27-2008
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I don’t think you'll have a problem with anything your asking about with a dumped exhaust. I’ve never had one but I really doubt it.

I do however have a few concerns to point out or high light. If you have dumps and a topper I would be a little leery of putting the kids in and taking off on a long trip. If I remember waaaaaaayyy back in the day I think some kids got killed in that exact scenario. It made a big enough impact on my family that my dad went out and piped his truck out from his dumps to out from under the body. It was someone that my mom and dad knew I don’t ever remember that I knew them. You know that CO is the silent killer. Most people don’t even realize that they are in jeopardy of CO poisoning until it’s too late. The ones that live just think they have a real bad headache.

Also you have to check with the local rules. If I remember correctly NC requires that exhaust exit out from the vehicle’s underneath. But that kinda goes with how tight law enforcement is and how picky they are at any given time. You know it’s the “Burnt out tail light getting you a DUI” thing.

Since I don’t live there any more and I don’t remember you’ll have to check. Any muffler shop should know if it’s required.


Just be safe and done give the man any of your hard earned money.

****
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  #5  
Old 03-27-2008
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there wont be any real problems with fumes unless ur idling and its really cold outside with a wind blowing from the back of ur truck to the front and ur sitting there for awhile

i would suggest a turn down, because just like was said above with someone melting their shock boot it will happen.

and i am thinking about having it exit in front of the rear tire out the side instead of my dumped just because i am thinking of going with a larger out mabye a 3" for more noise i dont know why. just throwing another option out there
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Old 03-27-2008
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#1, kids SHOULD NOT be riding in the back of a truck on a long trip, or a short trip for that matter. Unless, you have a canopy, and have the canopy slider and truck slider open. Even at that, the exhaust is flowing out and the vehicle is traveling, thus no "bad stuff" should be even getting close to being in the bed. There is no problem with Carbon Monoxide(or is it Dioxide?, lol), and dumping your exhaust. As I've said it before, I've never had a problem with dumped exhausts, and i've had them on 3, maybe even 4 rigs.

Yes, most states state the exhaust must exit outside on the vehicle, aka tailpipe, and you might fail your yearly/bi-yearly inspection due to the exhaust not exiting outside of the vehicle.

You did make a good point, but on a truck, the chance is very unlikely.
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  #7  
Old 03-28-2008
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i have a 2.5 single dump on mine and i love it. i have had no problems. mine dumps right at the rear end and points out and up to the right rear tire. had the first one point down and when four wheeling it would get hang up on stuff. so the second one points up and out.
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Old 03-28-2008
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I'll also add......you need to run a offset in/center out muffler. That would eliminate any hanging up problems with the use of a turn down. I have my turndown angled down and out.....pretty much at a 45 degree angle.....

(pic before rotating the turndown)
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  #9  
Old 04-18-2008
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Sorry to revive an old thread, but I have a question about dumped exhaust. If I get a si/do muffler dumped, will it be louder than a si/so muffler dumped?
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Old 04-19-2008
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ummm....good question.

????
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  #11  
Old 06-04-2008
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I second that?? I am wondering the same thing...

I want a new muffler, im thinking of going with the warlock muffler dumped?

OR maybe weld a cutoff before a Flowmaster Delta 10 series (the small one), cuz i have a single cab..and have the muffler dumped for show, but keep the cutoff open at all times..

Any ideas?? shane where do u get those clamps^^? will advance, or'reillys, or autozone have em
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  #12  
Old 06-04-2008
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If you are running dumps a SI/DO muffler may be a little bit louder, not by much. I personally would just run a SI/SO.
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  #13  
Old 06-04-2008
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I have a si/si magnaflow...

I only have about 15 inches of pipe that is bent..B/c im single cab, wonder if just adding a turndown will make much of a differnece..

I really wanna try a cutoff from summit
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  #14  
Old 06-04-2008
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A few of the reasons turn downs sound better/louder is because of the short pipe after the muffler (no long tail pipe to muffle sound).

But, the main reason is because the exhaust frequencies are being shot directly out of the muffler to the ground where the sound waves bounce off the ground and under the vehicle.
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  #15  
Old 06-04-2008
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if you are going to run a flowmaster 10 series and your state doesn't require a muffler then you would be just as well off w/o a muffler and just straight pipes.
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  #16  
Old 06-04-2008
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Quote:
Originally Posted by Pless215 View Post
if you are going to run a flowmaster 10 series and your state doesn't require a muffler then you would be just as well off w/o a muffler and just straight pipes.
I thought mufflers were mandatory??

How do you check
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  #17  
Old 06-04-2008
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In NC you must have a muffler
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  #18  
Old 06-04-2008
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personally am going the side exhaust route when i get the time... however i have an article that flowmaster contributed to i believe in car craft saying that some pipe on their mufflers at least 10-12 inches i believe? have to recheck tarticle to sure...for them to perform correctly and that a turndown doesn't cut it...any truth to that?
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  #19  
Old 06-05-2008
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No, look at the 05+ mustangs, the tailpipe is what, 3-5"?
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  #20  
Old 06-05-2008
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here I have this b4 my muffler I doubt hardly any of my exhaust is going through the FloWmaster 40 series
Name:  exhaustcutout.jpg
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Size:  52.5 KB
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