Over here, NJ, its about $18 a roll of 6" by 25'. It works!

 

Here is a pic of the label of the automotive insulation. $20 a roll at Pep-Boys. It is a big roll of what looks like 1/4" thick felt with a thin layer of aluminum foil on one side. I'm going to cover my door panels with this stuff this week. I plan to put a layer above my headliner board in a couple weeks.

 

Can you take pictures of all this when you do it?

 

I installed Fat Mat that i purchased off ebay. Works well and was cheaper then Dynomat. i plan on doing more of the XJ soon with the same stuff. hope this helps.

 

I'm actually undergoing a similar project. I hate road noise and my jeep already has a 3" lift from the previous owner. Last weekend I gutted it out. I purchased 50sq ft of this dynamat type stuff off of eBay for $80 shipped. I had to order more and have it laying in the garage. I also started experimenting with sound proofing and found something you might all find interesting. Bought it from Menards. Frost King aluminum backed rolled foam HVAC insulation. Costs $15 for about a 12 foot roll. I'm on my 3rd roll of that right now.

Dropping a socket head on the bare floor pan = super loud clank with vibrations

Dropping a socket head on the dynamat type stuff = loud thud w/o any ringing

Dropping a socket head on the frost king covered dynamat stuff = moderate to light thunk depending on drop location

I also purchased the dense foam yoga mats (were on sale for $4.99 each so i figured why not). Did a sound test drop on that as well... quiet thunk.

I plan on gluing the yoga mat pieces to the inside of the plastic trim pieces such as door panels, rear inside panels, center column, portions of removable dash.

Ill take photos of where im at in the project and post them on this thread. I found that by wrapping that frost king foam on top of the dynamat stuff made a huge difference. If I can remove the dash with success (kinda scared) then It should help me tremendously get to the firewall behind the blower area.

Although I am still not finished...by the time I actually am finished, I hope to have a decently quiet XJ.

 

If you're running a factory roof rack and it's in the most forward position it will make a lot of wind noise, just move it back to the middle. I'm following your thread because I too have hearing loss (war sucks) and would like for my wife not to have to yell and repeat herself constantly. Thanks for your service.

 

I know im jumping in a little late on the peel and stick stuff... I install windows and doors for a living and use very similar products on a daily basis and that stuff will not stick to anything for any period of time unless it is a very very clean surface then you have to blast it hard with a heat gun not too much tho because you can blast a hole in it but if its done right that stuff won't ever come off trust me I have tried to take it off it won't

 

bump for an update...I'm installing FATMAT this weekend.

OP: what have you done since Feb to help with the sound? I'm at 76db at 75mph. Anybody with Dynamat or similar know what their decibels are at highway speed?

 

What is the name of that app and what is it for

 

Android market: Noise Meter v1.7

 

When these XJ left the factory, they where quiet inside. All new parts, every thing was tight, had road tires on, etc. etc. Now to try to achieve that in a 11 year old car with 145k on it, would be quit a task. And pretty much a off frame restoration (so to speak) and expansive. But for sound damping, I would use a spray on material. Easier to apply and can get into areas that are hard to reach. Under coating would also help. Replace all your door and window seals. Along with going back to road tires. That would eliminate enough noise for the rest of the sounds, rattles and squeaks of loose interior trim and dash parts. To further drive you nuts.

 

The loose interior and dash panels are the worst to me. Ive been trying to figure out all mine for a long long time. Not to steal the thread. But dies anyone have any experience with cut fenders in the front increasing interior noise by letting air in thru the door? Im trying to fix this now.

 

It usually works best if you only trim about an inch off the fenders (which is pretty much just the flair mounting area) Than modify the plastic inner fender protection piece to fit. (And some silicone.) Other wise it just creates a giant air scoop. As you now know. New door seals might help?

 

Umm, mine are so cut out I barely have a fender left. Im gonna try new door seals and making a little aluminum deflector fir the air. Looking into my wheel well you can see the interior door panel a lil. Lol. I makes a horrible whistle, but only on the pass side, not drivers.

 

Guys normally stuff those pool toys called Water Noodles in to the top and back side of the fenderwells to decrease the noise and it helps keep the mud out too. Looks kinda silly if you don't paint them black but apparently it is quite popular to do.