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DakGuy
Dodge Dakota
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11/13/2003
22:45:04
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 Subject: Exhaust WAY too loud in cab! HELP!
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I just got a new muffler and I gutted my cat, and ran a new 3 inch tail pipe. The exhaust sounds amazing, but when its about 2000 rpm and up, its almost unbearable in the cab. Anything I can do to quiet it down? Im thinking its because i gutted the cat, and its echoing the noise under the cab. Should i just get a new high flow one? Thanks guys!
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RAT
Dodge Dakota
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11/14/2003
00:15:44
| RE: Exhaust WAY too loud in cab! HELP!
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That's all that I can think of. I think that getting a new High flow cat may cost, but it should help the sound in your cab. What kind of muffler do you have? I know that I remember posts talking about cab noise versus muffler brand. I have flowmaster and a high flow cat and as long as my windows are closed it's not that bad. Then again I kind of like the noise, but it can be a conversation killer when your girl is with you.
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DakGuy
Dodge Dakota
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11/14/2003
00:19:37
| RE: Exhaust WAY too loud in cab! HELP!
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Its a dynomax ultraflo. i know the muffler will affect it some, but it shouldnt have made it THIS loud in the cab. i figure that the cat is just echoing the sound, since its just an empty box setting under my passanger seat now. i dont mind some rumble, but i want to be able to hear the radio too. So a high flow cat should help me out? Think it will create enough sound insulation?
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fastyz400
Dodge Dakota
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11/14/2003
02:12:52
| RE: Exhaust WAY too loud in cab! HELP!
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I put my money on your muffler, heck, you can put a straight pipe in place of the cat and it would still sound the same.
I would replace your muffler. You must be picking up resonance from your muffler. I believe that ultraflo muffler is a pretty small muffler.
Take a look at flowmaster's website, it explains how resonance in your cab occurs.
Just my 2 cents worth of info. he he he
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01Motorsport
Dodge Dakota
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11/14/2003
09:46:05
| RE: Exhaust WAY too loud in cab! HELP!
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DakGuy: You had a recipe for noise there. The converter absorbs noise to some extent in the exhaust system. Pipe diameter has an influence, too: 2 1/2" is quieter than 3", etc. I had a Catco installed once for $130. For interior noise reduction, but great performance and sound out the back, you can't beat a Flowmaster 70 (also called "Big Block"). You can get one with 3"in-out. I prefer single in with 2 1/2" duals.
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Rob454
Dodge Dakota
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11/14/2003
11:13:55
| RE: Exhaust WAY too loud in cab! HELP!
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Does your exhaust go all the way out from the bed or did you cur it somewhere under the bed or possibly turn down tip? If so its gonna resonate more. I have a dynomax muffler ( just like the Brola) its a big round one I think its the race series. Sounds really good and I have no cab noise from it. My tires are a different story. Thats why I want to go back to a all terrain tread and get rid of the muds I have on there currently
ROb
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DakGuy
Dodge Dakota
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11/14/2003
11:30:38
| RE: Exhaust WAY too loud in cab! HELP!
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Yeah, Ive got a big round style one too. Its a complete stock replacement system, no turn downs or anything, same side exit. I cant see how the gutted cat isnt helping this noise resonate more though. It sounds as if its coming from right beneath the cab. It just seems to me that a 2.5 inch pipe going into an open 16 inch long empty metal box then going back to a 2.5 inch tube would increase noise more inside the cab. Does anyone agree with me on that, or should I just replace the muffler and not waste the money on a new cat?
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fastyz400
Dodge Dakota
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11/14/2003
14:38:30
| RE: Exhaust WAY too loud in cab! HELP!
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I still say it's the muffler, the only way your gonna get resonance is exhaust gases are restircted. The only restriction you have now is in your muffler. The cat is free flow now, so no restriction.
If, you have a tiny muffler, you will get resonance.
Use, the 70 series flowmaster, it works great, pretty quiet cab. But, not as much performance oriented as the 50 series which are louder.
If, you are still hesitant, call flowmaster's free tech support. Ask them about resonance and if your cat is the problem.
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Kowalski
Dodge Dakota
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11/14/2003
15:29:24
| RE: Exhaust WAY too loud in cab! HELP!
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It's really a combination of the two. I'd be tempted to add a cheap "cherry bomb" type resonator before considering putting the power choking cat back in. If that wasn't good enough, other low restriction mufflers with less resonance are available.
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DakGuy
Dodge Dakota
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11/14/2003
17:27:34
| RE: Exhaust WAY too loud in cab! HELP!
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I think im gonna buy a Dynomax Super Turbo muffler, they are chambered, so it should cut the noise down a lot, and ive heard of people complaining that they are too quiet anyway. This way, I can just exchange the mufflers when I want either more performance/sound, or a quieter everyday ride. Anyone have a the Super Turbo muffler?
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Rob454
Dodge Dakota
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11/14/2003
21:06:41
| RE: Exhaust WAY too loud in cab! HELP!
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My buddy has 2 cat converters he took off a hot rod jeep He also has a set of edelbrock mufflers and I believe they are 2 1/2 inch. I dont know what he is asking for them but heres his shop # 714 636 2740. his name is Jay
Rob
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DakGuy
Dodge Dakota
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11/15/2003
01:00:11
| RE: Exhaust WAY too loud in cab! HELP!
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Ok, ive done some research on here, and have read many posts saying that the ultra flo dynomax isnt that loud in their cabs, and how they really like it. Why would mine be so loud? Im gonna take the muffler off tomorrow, and see if i get the same horrible resonance with just the cat on there. If i do, im going with a new cat. If its not there, im gonna get another muffler. Any comments on this?
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Matt
Dodge Dakota
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11/15/2003
02:20:14
| RE: Exhaust WAY too loud in cab! HELP!
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I had a Ultraflow on my 2000 mazda 626 V-6, and I noticed a bit too much in car noise also. I had a hunch, so I tried an experiment. While on a lift I ran the engine and had my friend rev the engine to various rpm's. At certain rpm levels I found that the ENTIRE exhaust system would vibrate. Apparently, the backpressure and flow characteristics of the new muffler caused the pipes to resonate.
We then welded small square chunks of steel(about 1x2", 1/2" thick) to several areas on the exhaust. Guess what? No more in car noise. The only remaining sound was the sweet snarl out the back! If possible, give your Dakota the same test.
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urabonehead
Dodge Dakota
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11/15/2003
06:09:46
| RE: Exhaust WAY too loud in cab! HELP!
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u remove the stock quiet exhaust system and replace it with a loud noisy one then ask "Anything I can do to quiet it down?" whata bonehead!!!!! put the old one back on!!!!!!
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fastyz400
Dodge Dakota
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11/15/2003
10:41:33
| RE: Exhaust WAY too loud in cab! HELP!
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See, Matt just proved my theory,
The resistance of air is what causes the resonance. By welding the blocks in changes the resistance in the muffler by different turbulant air hitting the chambers in your muffler.
Thus, changing to a bigger muffler would solve your problem. But, would be quieter.
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FOURHUNDRED
Dodge Dakota
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11/15/2003
11:01:51
| RE: Exhaust WAY too loud in cab! HELP!
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AND THUS LOOSE U LOW END U DUMBAZZ
BIGGER AINT ALWAYS BETTER
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dakotman4dr
Dodge Dakota
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11/15/2003
16:10:00
| RE: Exhaust WAY too loud in cab! HELP!
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What's up Guy (if this is the same Guy I know), haven't seen you on the h-town r/t board in a while. Did you get the exhaust done at FMG? Talk to Ginther on the delphi board. He's went through so many differant exhaust set-ups, he's gotta know what would kill that ressonance.
later,
Blake
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DakGuy
Dodge Dakota
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11/15/2003
16:23:02
| RE: Exhaust WAY too loud in cab! HELP!
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Sorry, im not the same Guy, but thanks for the help and the contact info!
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islander
Dodge Dakota
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11/15/2003
21:22:28
| RE: Exhaust WAY too loud in cab! HELP!
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if you have room you might try a bullet muffler along with whatever muffler you already have on there.
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