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Exhaust is too loud inside the car after H/C/383

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Old 06-11-2011, 10:57 AM
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Unhappy Exhaust is too loud inside the car after H/C/383
My TD car was quiet at low rpm and idle and screamed under WOT, but now it's loud at any speed. It's a baby blower cam too.

It doesn't have any leaks now. The exhaust isn't even dumped - it exits out the back. But holy crap is it loud now inside. I have to blast the stereo just to drown it out. There is also a lot of suspension/road noise and a few squeaks and rattles (I did shocks and lowering springs all the way around and a brand new rear suspension and also poly motor/trans mounts).

What is some good sound deadening stuff to use? I'm going to do all new carpet while I'm at it I guess...
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Old 06-11-2011, 11:10 AM
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Poly Bushings are going to squeek a lot unless they're greased really good. I think that's also the source of your extra road noise, and maybe even some engine noise.

eBay Fatmat, it's a Dynamat knock off, but it works well.
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Old 06-11-2011, 11:11 AM
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I think you will need to quiet the exhaust down some; I have the same problem, my car sounded nice before all of my engine mods. I am looking for some type of resinator that could be put in the exhaust pipe and will not take too much effort to do.
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Old 06-11-2011, 11:17 AM
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That's why I got rid of my true duals.
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Old 06-11-2011, 11:23 AM
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Originally Posted by speed_demon24
That's why I got rid of my true duals.
Nevar! I'll put high flow cats in if I have to.
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Old 06-11-2011, 11:27 AM
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Originally Posted by Z28Roxy
Nevar! I'll put high flow cats in if I have to.
Tried that and they didn't do anything at all.
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Old 06-11-2011, 11:28 AM
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Originally Posted by Z28Roxy
Nevar! I'll put high flow cats in if I have to.
just keep stacking mufflers in there lol........i got 3 mufflers and a y pipe merge trying to keep mine quiet and its still loud........guess thats 14.2:1 CR for ya
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Old 06-11-2011, 11:32 AM
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Originally Posted by quik95lt1
just keep stacking mufflers in there lol........i got 3 mufflers and a y pipe merge trying to keep mine quiet and its still loud........guess thats 14.2:1 CR for ya
Yeah I don't get why mine is that loud. hehe.

383, 218/230 cam, unported trickflow heads 9.3:1 or so CR only.
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Old 06-11-2011, 06:26 PM
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Dynamat? Its a sound deadning (sp?) material. I think Best Buy sells it for car stereo systems. (help keep the music in the car)
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Old 06-11-2011, 06:53 PM
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Ear Plugs....
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Old 06-11-2011, 07:31 PM
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Put louder speakers, it will sound better with Hair of the Dog blaring out the speakers..
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Old 06-11-2011, 08:18 PM
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A Honda or some type of Hybrid might help this problem


But my true duals are great nice and quiet.......Well on the stock motor it was.....
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Old 06-11-2011, 08:23 PM
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Originally Posted by TwoFast4Lv
Ear Plugs....


Alternative solution would be hearing loss, then you won't notice it so much but everyone else will. WIN WIN
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Old 06-11-2011, 09:25 PM
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Borla XR-1
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Old 06-11-2011, 09:35 PM
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Spray it
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Old 06-11-2011, 11:36 PM
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Originally Posted by Z28Roxy
Yeah I don't get why mine is that loud. hehe.

383, 218/230 cam, unported trickflow heads 9.3:1 or so CR only.
Why 9.3:1 are you going to run a turbo or supercharger?
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Old 06-12-2011, 05:41 AM
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Put on a "tubo muffler". See what that does
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Old 06-12-2011, 06:27 AM
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If its too loud, you're too old. On a serious note...some cats and/or muffler change would help. Personally,I would not add any of the dynamat.
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Old 06-12-2011, 06:43 AM
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they have spray on sound deadener now.. cant remember the name tho
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Old 06-12-2011, 11:16 AM
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Originally Posted by Wicked94Z


Alternative solution would be hearing loss, then you won't notice it so much but everyone else will. WIN WIN
WHAT?

Originally Posted by henry172
Why 9.3:1 are you going to run a turbo or supercharger?
Yes supercharger
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