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post #1 of (permalink) Old 05-07-2018 Thread Starter
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Dynamax Soundproofing a 2016 Impala LTZ Limited

The 2006-2016 Impala is a great entry level car into the GM brands, Chevy, Buick, Cadillac, etc. To keep costs low, they are very minimal in the soundproofing of the car, using the bare amount to keep in within acceptable levels. This is a car that can really benefit from a good soundproofing, whatever product you may use.

After doing many different cars with different soundproofing materials, I prefer to use Dynamax products as I only like to pull the interior once. It costs a bit more but is worth it to me, and has never failed or fallen off headliners, saving me from another strip down.


Though it is rather easy to remove the interior of the car,it’s time consuming to cut and measure and properly do a car. Plan on 30-40- hours, depending on how much product you use and how much footage you cover.
On this car I did a pretty heavy coverage compared to others but was extremely happy with the results, dropping the interior 7-10 decibels, as measured with a Decibel Soundmeter, under the same road, speed, and weather conditions.

To start with, get out your ruler and measure the rough estimate of how many square feet you need. I use the Dynamax to get rid of resonance and sound, and top that with Dynaliner to reduce the thermal (heat/cold) and sound properties even more. For Dynaliner, I used inch on all floors and headliner, with 1/8 inch on all sides, except the wheel wells which got inch.

Start with the trunk or doors to get practiced at it before tackling the interior. After that the interior will go smoother and faster.

The trunk has no thermal or soundproofing other than the spare tire cover. The sides and wheel wells have no SP (Sound Proofing) at all, just the side covers. It’s a real tin can. (Some of these pics are out of order)
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Last edited by Sealclubber; 05-08-2018 at 06:16 AM.
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I did the trunk up to the backseat, then moved on to the doors.
The doors come out with 4 torx bolts, 1 behind the lever, 2 under the handle and 1 at lower rear. The door panel will snap out after that. Buy the plastic pry bars for interiors at Harbor Freight, it will make the job easier.

The doors are not lined with any soundproofing. You can remove the lever cable or just set the panel down as I did, and make a slit for it. I put Dynamax on the outer door skin, and Dynamax and Dynaliner 1/8 inch on the inner door skin.
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Last edited by Sealclubber; 05-07-2018 at 05:32 PM.
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Once all 4 doors are done, its time to begin with the interior. Remove the backseat by pulling the two lower handles and lifting the seat out. Remove the seatbelt nuts and lift the seatback up and out. This allows you to do the rear of the car without removing the front seats and interior now. As you can see, there is very little factory soundproofing under the rear seat area.
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Last edited by Sealclubber; 05-07-2018 at 04:17 PM.
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Once all is done up to the front of the rear seat, it’s time to tackle the interior.


First disconnect the battery so as to de-energize the Airbags. Wait 1 min. + before any work. Don't won't to blow your head off.


Second, you must remove the front seats, 2 rear bolts and the seat lifts up from the rear and out. Easier with two people and you still have to remove the seatbelt mechanism. I did a quicker way by placing them on the rear seat folded down, leaving the belts on and saving the trim from damage. They are heavy and this was fast and easy.


Remove the center arm rest and console.


After removing the console metal mount, snap out the side trim and the carpet comes out in one piece.
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Last edited by Sealclubber; 05-08-2018 at 02:17 PM.
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Now you can see all the exposed metal. Lay down Dynamax followed by inch Dynaliner on the floor and 1/8 inch on the side posts
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Last edited by Sealclubber; 05-07-2018 at 05:07 PM.
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Dynaliner applied over Dynamax. (last pic out of order)
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Last edited by Sealclubber; 05-08-2018 at 06:22 AM.
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Put the carpet and console back in, slide the seats into position and you are done.
I put the seats in to give the headliner something to rest on that protects it from creasing and getting dirt smudges.
Now its time for the final part, the Headliner. Use caution and go slowly, easier with two people.
Remove the visors, handles, upper console and side trim, then gently lower it down onto the seats with headrests removed. Wash hands often to prevent smudges.
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Last edited by Sealclubber; 05-08-2018 at 06:23 AM.
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Now you can see that the roof is one big tin can of metal with only two small white foam strips on the headliner for deadening the resonance above.
Line it with Dynamax then layer it with Dynaliner 1/4inch
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Last edited by Sealclubber; 05-07-2018 at 05:40 PM.
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Button it all back up and take it for a drive. Big grin to follow!

At 65 on smooth asphalt road, the factory Impala averages 88db (+/- 3db) with spikes to 91+ db’s on rougher concrete highway roads with sound meter at ear level. After soundproofing, it dropped to 79-82 db’s, a very significant drop. I have noisy tires, the only thing I can barely hear, but with Michelins, it would be a 2-3 db’s lower. The car is very solid now, nothing but a thud anywhere you rap your knuckles. The doors close like bank vaults, and the cars next to you can barely be heard now.

Music sounds much better and can be played lower in volume with more instruments being heard. Phone conversations are spoken at lower levels and I can turn the ear volume down.

In rain, the sound of splashing puddles sounding like a firehose on a metal drum is gone. In fact the only sound of rain is it hitting the windshield now! No more loud drumming of rain from the roof either.

Also noticeable is the lower settings on AC and heat, as the Dynaliner has added extra thermal protection, you don’t have drafts or even feel how hot/cold it is out.

The car now feels tight and quiet as any high end luxury car, while making the drive feel that much more enjoyable and less tiring, due to the soundproofing it never had.

With a few basics like soundproofing, police brakes, quality struts, tires, and a minor tune, the Impalas can rival any basic BMW 5 series with Automatic Transmission (I had a few) in fun, ride, and quiet for a fraction of the cost.

The soundproofing was the piece that brought it all together to give it that final feel of a Luxury Performance Car. Highly recommended!

Last edited by Sealclubber; 05-08-2018 at 02:20 PM.
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That is a fantastic write up. Thanks! Looks like you did a fantastic job. I always thought that the 8th Gen could have used a little more soundproofing, and you may just have convinced me to bump it up my priority list.

Once again, great write up and thanks.


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post #11 of (permalink) Old 05-08-2018 Thread Starter
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Thanks TeeRev.
Try it, you won't be disappointed.


Another thing to make this job easier is to be sure to get the Roller for the Dynamax, it makes it really conform and stick to the metal.


Also get the Fiskars Duck Edition scissors which have a special coating on them for cutting Duct tape. It prevents the glue side from sticking to the scissors and gumming them up. Makes for cleaner and faster cuts.
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This is an awesome write-up. I've only did the trunk in mine and I didn't go as far as installing the additional "Liner". I am planning to do the entire car at some point and this will be a great guide lol.

I really need to do the roof, but I admit, dropping the headliner was a bit daunting. Now that you explained how to do it, it seems rather simple. I might tackle that this weekend if I have time.
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Yeah, great post! So far, I've only done my rear deck and my front doors (with Noico 80mil and Noico Liner - look it up - excellent product and prices!), but just doing the front doors and rear deck made a HUGE difference for my audio - no more vibration sounds from the bass and much better bass to boot!! Can't wait to do the floor. Not sure if I'll do the roof or trunk, but maybe someday. :-)

I tired to drop the rear of my headliner once and gave up. I have a sunroof and the little plastic things that hold the headliner up in the rear are HUGE on cars with a sunroof - and I couldn't get the damn things out - i was so afraid of the "heads" of the plastic things breaking off when I tried to remove them - and I pulled on those things pretty damn hard before I gave up.

Here is a comparison picture of the normal versions and the versions used on headliners when you have a sunroof - pretty major difference:


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Wow! Great write up and that's a lot of work. I bet the car is a cocoon now.

2009 Impala SS (sold 3/2012)
2014 Impala Limited LTZ 3.6 V6(traded 7/2019

2017 Cadillac XTS Platinum V Sport 3.6TT AWD
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2007IMP850- Thanks. Good start. Every piece you do will show/hear results, getting better each time. Do it as you can afford it. No hurries..


Trosky- get the tools at Harbor Freight. It seperates the amatuers from the Pros, and saves your trim, panels, paint, and trim pins, from destruction. Those big ones will break w/o the proper tool. I'll post a pic of the sunroof on DTS when I get back as an example.
https://www.harborfreight.com/5-piec...set-67021.html


TSS- Thanks.
First time sitting at a light, I couldn't hear any cars running next to me until I rolled the window down! Really impressed me..
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