Yeah, I know that heat is also used. Come on give me a break, I typed that at 2 in the morning.

 

Does the spray or the mat quiet exhaust or engine noises from entering the cabin?

 

Yeah im talking about the air vent, this is at the bottom, of where people usally put their stealth box. What other things is that air vent their for? Once it stops raining I will probably put it back on. But Doesn't the carpet itself trap any air leaveing or entering the air vent from the inside, since you have to remove the carpet to get to the air vent, doesn't the carpet itself act as a close barrier?

 

Yes. It'll help quiet anything if you put it in the trouble spots. Internal exhaust can be quieted by matting the trunk area, and one could mat the hood or firewall to quiet engine noise.

I didn't need to pull mine out when I put my stealth in there. Might be a difference in car models between us, though. I think the major reason it was there was for air exchange, and to help the cabin pressure when closing the hatch. I don't know.

 

Are you talking about the undercoating spray or is it actually 'sound deadening'? Sounds alot like undercoating I used when replacing floor pans, etc although it is primarily to eliminate vib/road noise from underneath the car. Just curious because I would much rather use this than the stickons. Seems it would be much easier overall as well if doing many areas of the interior.

 

where exactly should it be applied for best results?

 

Yup, 3M ruberized Undercoating. Sound deadening itself unless it's a foam style; is just adding mass to change the resonant frequency of the parts that it's bonded too. Thus the weight of dynamat. The 3M RU works great in all the cars that I've used it in (I've sprayed 6 different cars), and they all sound great. It reduces ambient noise immencely.

As for rattles; foam weatherstripping between whatever is rattling is the best. I've never figured out how dynamat is supossed to stop rattles.

 

My last car was a Civic, and I am the only Civic owner ever to use Dynamat to stop a trunk rattle. I bought it to put it on the trunk lid to stop the trunk from rattling. It didn't work. I put it on the back of my license plate to stop that from rattling. But then I got it to actually do something. I put it on the trunk latch. As in I actually covered the loop of metal that the latch catches on with Dynamat. It would get torn up if I opened the trunk a lot but there wasn't really any storage in there anyway due to the amps & subs. So a big huge square of Dynamat, I only used about 2 square inches. And it KILLED the trunk lid rattle. But I never had any problem with adhesion, I just used my hand to press it on the trunk lid. But basically, Dynamat is just mass loading, so if you apply it to the car panels it will just kill road noise or ambient noise, but the only rattle prevention it does is if you actually apply it to the point of contact of whatever is rattling. Use the 3M stuff for mass loading, Dynamat is a rip off.

Abe

 

I definitly learned this. All of my big rattles I had to put some type of rubber cushin to stop the rattles.

I had always thought thats what dynamate did; remove rattles- caused by the bass-(subs). But ed2 doesn't remove the rattles. But the inside bass sounds better just doesn't sound as loud from the outside.

 

So are we talking at a level of being able to reduce inside the cabin, "Loudmouth+longtubes+ory" loud?? Towhere it is not annoying and you can hold a decent convo?

 

There are limits to sound deadening... To muffle all that noise would take a lot, but it will lessen it to a point.

I run Hooker LTs, custom X-pipe, twin Bullet Mufflers, then dump out the sides infront of the rear tires... and I can have conversation just fine.

 

How does the thickness compare to Dynmat-type deadeners?

I'm planning on deadening the entire floor when I install new carpeting and am trying to pick a good product to use. I'm wondering if the spray would make for an uneven layer which would feel weird under the carpet.

 

I too would like to know the answer to this.

 

How much weight does using the 3m ru add to a car, I would'nt think it would be alot?

 

Peel and seal, is the best and cheapest sound deading out there, home depo, or lowes have it 12 bucks a roll, read this article http://www.sounddeadenershowdown.com/, i have peel and seal in the entire back of my camaro, i have 2 12' alpine swx-1242d's each pumping out 1000 watts, before the peel and seal my car felt like i was on the west coast in an earthquake, after the install doesnt vibrate at all very happy with the stuff, does add a little weight but its worth it in the long run