A few drone/sound questions...PLEASE help!!!
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Joined: Dec 2001
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From: Way the hell in front of you
A few drone/sound questions...PLEASE help!!! Okay, here it is...
No muffler
!right cat - straight pipe instead
3" intermediate
ST3500
poly trans mount
LOTS OF DRONE!!!
The main question I have is, I want to put a dynomax bullet muffler in the I pipe b/c from what I gather it rids the car of drone. As you can imagine, the car, being an A4, drones quite a bit.
- By adding a bullet muffler, how much of the exterior sound am I sacrificing? (It sounds unreal!)
- How much performance am I sacrificing? (Is it marginal?)
- Wil it REALLY get rid of the interior drone? By what, 25%, 40%, etc...?
PLEASE! I need to know. The interior is just unbearable since the addition of the ST3500. I love the exterior sound, but something's gotta change.
- What about sound deadening material?
Answers are truly appreciated!
Nick
No muffler
!right cat - straight pipe instead
3" intermediate
ST3500
poly trans mount
LOTS OF DRONE!!!
The main question I have is, I want to put a dynomax bullet muffler in the I pipe b/c from what I gather it rids the car of drone. As you can imagine, the car, being an A4, drones quite a bit.
- By adding a bullet muffler, how much of the exterior sound am I sacrificing? (It sounds unreal!)
- How much performance am I sacrificing? (Is it marginal?)
- Wil it REALLY get rid of the interior drone? By what, 25%, 40%, etc...?
PLEASE! I need to know. The interior is just unbearable since the addition of the ST3500. I love the exterior sound, but something's gotta change.
- What about sound deadening material?
Answers are truly appreciated!
Nick
TECH Junkie
Joined: Nov 2001
Posts: 3,987
Likes: 0
From: Melbourne, FL
Re: A few drone/sound questions...PLEASE help!!! </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by INSSANE:
<strong>- By adding a bullet muffler, how much of the exterior sound am I sacrificing? (It sounds unreal!)
- How much performance am I sacrificing? (Is it marginal?)
- Wil it REALLY get rid of the interior drone? By what, 25%, 40%, etc...?
</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">You'll change the overall volume very little by installing a bullet muffler. The Dynomax bullets are a straight-through design and pretty unrestrictive. Another choice may be a Moroso spiral-flow (same exterior dimensions as the Dynomax, but different internal design). Neither do much to make the car quiet.
As far as performance, on most cars these mufflers won't hold you back one bit. My car ran the same with the Moroso 3" spiral flows (as the only muffler on the car, BTW) as it does/did with Flowmaster 1-chamber race mufflers. The Flowmasters sound much better, though.
Will it get rid of the drone? Waaaay back when my car was relatively stock with MAC headers and ORP, I installed a pair of Dynomax bullets for the same reason you want to. It totally changed the "tone" of the car w/o really changing the volume, and got rid of pretty much all of the raspy/drone sound it had.
<strong>- By adding a bullet muffler, how much of the exterior sound am I sacrificing? (It sounds unreal!)
- How much performance am I sacrificing? (Is it marginal?)
- Wil it REALLY get rid of the interior drone? By what, 25%, 40%, etc...?
</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">You'll change the overall volume very little by installing a bullet muffler. The Dynomax bullets are a straight-through design and pretty unrestrictive. Another choice may be a Moroso spiral-flow (same exterior dimensions as the Dynomax, but different internal design). Neither do much to make the car quiet.
As far as performance, on most cars these mufflers won't hold you back one bit. My car ran the same with the Moroso 3" spiral flows (as the only muffler on the car, BTW) as it does/did with Flowmaster 1-chamber race mufflers. The Flowmasters sound much better, though.
Will it get rid of the drone? Waaaay back when my car was relatively stock with MAC headers and ORP, I installed a pair of Dynomax bullets for the same reason you want to. It totally changed the "tone" of the car w/o really changing the volume, and got rid of pretty much all of the raspy/drone sound it had.
TECH Enthusiast
Joined: Nov 2001
Posts: 688
Likes: 2
From: Derby, KS
Re: A few drone/sound questions...PLEASE help!!! </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by INSSANE:
<strong>Okay, here it is...
No muffler
!right cat - straight pipe instead
3" intermediate
ST3500
poly trans mount
LOTS OF DRONE!!!
The main question I have is, I want to put a dynomax bullet muffler in the I pipe b/c from what I gather it rids the car of drone. As you can imagine, the car, being an A4, drones quite a bit.
- By adding a bullet muffler, how much of the exterior sound am I sacrificing? (It sounds unreal!)
- How much performance am I sacrificing? (Is it marginal?)
- Wil it REALLY get rid of the interior drone? By what, 25%, 40%, etc...?
PLEASE! I need to know. The interior is just unbearable since the addition of the ST3500. I love the exterior sound, but something's gotta change.
- What about sound deadening material?
Answers are truly appreciated!
Nick</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I'm running gutted cats with zero drone (3500 stall too) Something about having a chamber there instead of just a pipe just cancels out the drone.
<strong>Okay, here it is...
No muffler
!right cat - straight pipe instead
3" intermediate
ST3500
poly trans mount
LOTS OF DRONE!!!
The main question I have is, I want to put a dynomax bullet muffler in the I pipe b/c from what I gather it rids the car of drone. As you can imagine, the car, being an A4, drones quite a bit.
- By adding a bullet muffler, how much of the exterior sound am I sacrificing? (It sounds unreal!)
- How much performance am I sacrificing? (Is it marginal?)
- Wil it REALLY get rid of the interior drone? By what, 25%, 40%, etc...?
PLEASE! I need to know. The interior is just unbearable since the addition of the ST3500. I love the exterior sound, but something's gotta change.
- What about sound deadening material?
Answers are truly appreciated!
Nick</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I'm running gutted cats with zero drone (3500 stall too) Something about having a chamber there instead of just a pipe just cancels out the drone.
Joined: Nov 2001
Posts: 34,610
Likes: 2,522
From: Schiller Park, ILL Member: #317
Re: A few drone/sound questions...PLEASE help!!! </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Dave Carney:
<strong>[quote]I'm running gutted cats with zero drone (3500 stall too) Something about having a chamber there instead of just a pipe just cancels out the drone.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">This is 100% correct. Both myself and another member on this board have also tested this theory with our cars and found it to be correct. I don’t think that the gutted cat shell flows as well as an ORP though. I took the gutted cats off and went back to an ORP and changed my catback to a 2OTL (used to have flowmaster) and I have no more rasp...
<strong>[quote]I'm running gutted cats with zero drone (3500 stall too) Something about having a chamber there instead of just a pipe just cancels out the drone.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">This is 100% correct. Both myself and another member on this board have also tested this theory with our cars and found it to be correct. I don’t think that the gutted cat shell flows as well as an ORP though. I took the gutted cats off and went back to an ORP and changed my catback to a 2OTL (used to have flowmaster) and I have no more rasp...
Re: A few drone/sound questions...PLEASE help!!! You only have one cat removed? You friends with Benny? <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
The bullet will reduce the 2500 rpm raspy sound.
I'd ditch the other cat or put two good aftermarket cats on, I don't think running one cat is good for the pcm and sensors.
The bullet will reduce the 2500 rpm raspy sound.
I'd ditch the other cat or put two good aftermarket cats on, I don't think running one cat is good for the pcm and sensors.
Staging Lane
Joined: Jan 2002
Posts: 99
Likes: 0
From: newburgh, in
Re: A few drone/sound questions...PLEASE help!!! ya man, you need to either remove both cats or have them both there. that creates a serious unbalance between the left and right cylinder banks.
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Thread Starter
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Joined: Dec 2001
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From: Way the hell in front of you
Re: A few drone/sound questions...PLEASE help!!! I might just have to put it back on since the yank makes it sound so loud anyways.
That's what I'll do first because of all this bank ****. You learn something new every day!
Nick
That's what I'll do first because of all this bank ****. You learn something new every day!
Nick
