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Old 03-28-2004, 11:25 AM   #1
Blair
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Default How to quiet exhaust noise in interior

I have a prodrive muffler and 3rd cat eliminator and would like to know if anyone has had success in reducing the interior noise with an aftermarket exhaust. I was thinking about 1) adding some under carpet padding in the trunk under the stock carpet or 2) some dynamat in the trunk in the area where the muffler is or 3) adding a little polyfill batting like used in speaker boxes to the sides of the trunk behind the panels. Has anyone has success with these? Any other suggestions would be appreciated.

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Old 03-28-2004, 05:24 PM   #2
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I used Mass-Loaded Sheeting Vinyl Barrier from mcmaster.com (part number 54665T32). The stuff is a little heavy and a little awkward to work with but I managed to trim a single piece so it fit under the parcel tray, behind the rear seat, and in front of the rear wheel wells. It works like a charm. Do not do this if you plan to add a subwoofer in the trunk.
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Old 03-28-2004, 09:40 PM   #3
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is the prodrive that loud?
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Old 03-28-2004, 10:08 PM   #4
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Quote:
Originally posted by csleee
is the prodrive that loud?
Yes, my friend has it and it is DEFINITELY loud. It's got a nice sound, but cruising on the highway for 2 hours going 80-105mph the whole time made me realize just how friggin' loud that thing is.
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Old 03-28-2004, 10:40 PM   #5
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To some it may not be loud in comparison... I guess I must be old. Sounds great outside of the car when someone else is driving, but when your in the car driving it can be a bit loud.
Today I bought some thick under carpet padding from Home Depot and cut it to match the trunk liner... No difference in volume with the windows rolled up... Oh well, maybe I'll just have to get used to it.

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Old 03-28-2004, 10:50 PM   #6
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I got rid of my Prodrive 'cuz it was too quiet.
I have a 3" Stromung and I almost don't hear it in the car when driving on the highway...even at 80+mph.
Hell, my tires are louder than the exhaust on the highway.

I'd almost be willing to bet that the exhaust is touching something somewhere under the car and causing the noise inside the car.
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Old 03-28-2004, 11:35 PM   #7
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Yeah. I just bought a prodrive oval-tip... Can't say I think it's too loud. And the day after I put it on, I drove 160 miles from Newport News to Fairfax. I really can't say it droned at all!
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Old 03-29-2004, 12:01 AM   #8
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I have the Prodrive axelback.I think its to quiet.Only at WOT is it some what loud.
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Old 03-29-2004, 01:41 AM   #9
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I'm happy with the HKS rumble on the highway
its actually very quiet on cruise control
the sound is responsive/proportionate with throttle
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Old 03-29-2004, 01:52 AM   #10
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Make sure the tip extends past the bumper?
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Old 03-29-2004, 10:32 AM   #11
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have a leak in any of the pipes? i think the prodrive is not that loud. I can hear classical music going at 80mph
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Old 03-29-2004, 01:07 PM   #12
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No leaks and the tip goes past the bumper by about 1.5" May try some sound deadening in the rear fenderwell area.

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Old 03-29-2004, 01:10 PM   #13
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Anyone know of a good sound deadening material for cars? Everything I see is for high end home setups.
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Old 03-29-2004, 02:05 PM   #14
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Dynamat Xtreme works pretty well.

Have used it in the past for audio applications. I plan on using it in the next few weeks on my wagon (open a$$-end makes it a little louder than a sedan).
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Old 03-29-2004, 02:14 PM   #15
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My experience with sound deadening is that while it reduces the overall noise levels, it helps more with reducing harsh buzzing type noises caused by resonances in the doors, sheet metal and chassis. I've used Raamat.

A layer of carpet padding in the trunk under the carpet did help to reduce exhaust noise. It is also very easy to do and doesn't add a material amount of weight.
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Old 03-30-2004, 08:40 PM   #16
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Quote:
Originally posted by Rich10

A layer of carpet padding in the trunk under the carpet did help to reduce exhaust noise. It is also very easy to do and doesn't add a material amount of weight.
and it's cheaper... much cheaper.
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Old 06-22-2005, 08:56 PM   #17
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Coming from a HiFi/Home Theater background, fiberglass is one of the best absorbtion materials, especially for low frequencies. On of the best improvements you can make to your home system is to sit rolls of fiberglass insulation from HD in each corner of the room to act as bass traps (dress'em up if you've got a significant other).

I wonder how this could be applied to a car application? Compressed fiberglass (rockwool) panels under the trunk liner and rear seat?

Any thoughts?

Bill
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Old 06-22-2005, 08:59 PM   #18
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Quote:
Originally Posted by wgb113
Coming from a HiFi/Home Theater background, fiberglass is one of the best absorbtion materials, especially for low frequencies. On of the best improvements you can make to your home system is to sit rolls of fiberglass insulation from HD in each corner of the room to act as bass traps (dress'em up if you've got a significant other).

I wonder how this could be applied to a car application? Compressed fiberglass (rockwool) panels under the trunk liner and rear seat?

Any thoughts?

Bill
Yeah here is a thought... why try to add power with an exhaust system...then ADD weight to take it away?
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Old 06-22-2005, 09:00 PM   #19
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The friggin thing is LOUD Rob!!!

Bill
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Old 06-22-2005, 09:43 PM   #20
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Quote:
Originally Posted by wgb113
The friggin thing is LOUD Rob!!!

Bill
No it isn't!!! Sounds and looks awesome in my opinion.
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Old 06-22-2005, 09:55 PM   #21
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Thanks Rob. I will stop being paranoid.

Bill
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Old 06-22-2005, 09:55 PM   #22
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....this is one of those ridiculous hundhua things that people THINK that it has to be loud to make power....IT DOES NOT have to be stupid loud....just on a hunduha.....on a Subaru, it's just obnoxious.
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Old 06-22-2005, 10:04 PM   #23
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Unc,

It's really not that loud I suppose...just have to get used to hearing ANYTHING! Bone stock you couldn't even tell the car was on it was so quiet. Rob gave me a listen to his and it's as-loud in the cabin and louder outside of the car than mine is.

Then on the way to get gas I was reassured by an Integra, Cavalier, and Mustang that my is not loud at all.

Bill
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Old 06-22-2005, 11:14 PM   #24
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I'm think of grabbing some of this stuff for my Wagon. Works two fold, sound reduction and heat reduction.

http://www.lobucrod.com/

-Matt
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Old 06-22-2005, 11:47 PM   #25
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a catless system with Prodrive muffler is VERY quiet... even at WOT its quiet.

if you want quieter, go down to an STI axleback...

and yes, i have a prodrive oval tip on my wagon.. its not loud at all, even the old Turbo XS magnaflow was louder, the STI Genome was louder, from what i remember, the Borla hush is almost the same volume.

i wouldnt work around the problem, i'd correct it.

maybe my muffler is broked cause it was on an RS(custom midpipe).. i THOUGHT these were louder than what it is..
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