reducing exhaust noise
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
reducing exhaust noise
I have a noise issue in the sense that the exhaust can get really loud at times and it's virtually impossible to enjoy a radio in the car.
Now, I do not have the easiest of engines in this regard and my exhaust consists out of a dual ss exhaust of 3" with bullet style mufflers under the seats and a Magnaflow straight through muffler in the rear.
The sound of the exhaust as far as the tone is concerned is great.
I just have the impression that the exhaust is bouncing off the walls of the rear compartment, creating a box like effect.
Any solutions ?
Now, I do not have the easiest of engines in this regard and my exhaust consists out of a dual ss exhaust of 3" with bullet style mufflers under the seats and a Magnaflow straight through muffler in the rear.
The sound of the exhaust as far as the tone is concerned is great.
I just have the impression that the exhaust is bouncing off the walls of the rear compartment, creating a box like effect.
Any solutions ?
Race Director
Joined: Sep 1999
Posts: 11,361
Likes: 383
From: Plano TX
Well, dynamat style insulation will certainly help. Especially on the rear wall of the tub.
Another thing to keep in mind is that the longer the case of the muffler, the lower the volume (all other things unchanged). A 18" straight-through muffler will be quieter than the typical 14".
You already have an X-pipe, I hope?
Another thing to keep in mind is that the longer the case of the muffler, the lower the volume (all other things unchanged). A 18" straight-through muffler will be quieter than the typical 14".
You already have an X-pipe, I hope?
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
Well, dynamat style insulation will certainly help. Especially on the rear wall of the tub.
Another thing to keep in mind is that the longer the case of the muffler, the lower the volume (all other things unchanged). A 18" straight-through muffler will be quieter than the typical 14".
You already have an X-pipe, I hope?
Another thing to keep in mind is that the longer the case of the muffler, the lower the volume (all other things unchanged). A 18" straight-through muffler will be quieter than the typical 14".
You already have an X-pipe, I hope?
I'm not quite seeing why the rear compartment would reflect the noise that much with a rear exit exhaust.
Last edited by Belgian1979vette; Jul 4, 2016 at 04:31 PM.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
larger case turbo style wil quiet it down some
Had bullets never cared for them seemed to make thigns worse
Cockpit acts like a speaker box
cant help but think the pipes transmit harmonic frequency throughout the car, the pipes vibrate. Wondering if clamping some type of dampening material over a given section of pipe couldnt dampen that and help out somehow.If you think about it its a long piece of pipe that vibrates, that has to contribute to interior noise/resonance outside pure exhaust note
Had bullets never cared for them seemed to make thigns worse
Cockpit acts like a speaker box
cant help but think the pipes transmit harmonic frequency throughout the car, the pipes vibrate. Wondering if clamping some type of dampening material over a given section of pipe couldnt dampen that and help out somehow.If you think about it its a long piece of pipe that vibrates, that has to contribute to interior noise/resonance outside pure exhaust note
Race Director
Joined: May 2006
Posts: 18,734
Likes: 2,582
get rid of the bullets and install these in the back
http://www.dynomax.com/dynomax-vt-of...red-17157.html
http://www.dynomax.com/dynomax-vt-of...red-17157.html
Race Director
Joined: Sep 1999
Posts: 11,361
Likes: 383
From: Plano TX
get rid of the bullets and install these in the back
http://www.dynomax.com/dynomax-vt-of...red-17157.html
http://www.dynomax.com/dynomax-vt-of...red-17157.html
Drifting
Joined: Dec 2011
Posts: 1,743
Likes: 289
From: Chardon Ohio
I'm no expert but I have the Corvette Central system which has a cross over, true duals, and Magnaflows in the back. I replaced the Magnaflows with smaller ones to make it a little louder. The sound is great, deep and low. I don't know why you would have another set of mufflers under the seats/cab. Maybe there is a good reason.
Jim
Jim
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Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
I'm no expert but I have the Corvette Central system which has a cross over, true duals, and Magnaflows in the back. I replaced the Magnaflows with smaller ones to make it a little louder. The sound is great, deep and low. I don't know why you would have another set of mufflers under the seats/cab. Maybe there is a good reason.
Jim
Jim
Not the average engine under the hood.
Former Vendor
Joined: Jan 2015
Posts: 412
Likes: 64
Larger mufflers will help bring the volume of your exhaust down, and laying dynamat, or another sound insulator will help reduce cabin noise. In our experience, placing the sound deadening behind the seats and in the trunk was most effective, though some people go as far as doing the entire body.
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
Larger mufflers will help bring the volume of your exhaust down, and laying dynamat, or another sound insulator will help reduce cabin noise. In our experience, placing the sound deadening behind the seats and in the trunk was most effective, though some people go as far as doing the entire body.
BTW : my mufflers are 14" ones. which were the max I could comfortably fit under the car in the rear.
Last edited by Belgian1979vette; Jul 6, 2016 at 03:52 PM.
Race Director
Joined: Sep 1999
Posts: 11,361
Likes: 383
From: Plano TX
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 2,164
Likes: 7
From: Beringen
This is what I found fit best. The muffler is angled so that most of it stays behind the bumper and only one side is more or less visible. Other option would have been to angle the tips down, this would have let me use a center out.